is-. 



Volume Two 


Number Three 


SCHOOL OF MINES 
AND METALLURGY 

UNIVERSITY OF MISSOURI 


BULLETIN 

FEBRUARY, 1916 


TECHNICAL SERIES 


CUPELLATION LOSSES IN ASSAYING 


ROLLA, MO. 
















THE MINING EXPERIMENT STATION 


Officers of the Station. 

Albert Ross Hill, Ph.. D., LL. D. President of the University. 

Austin Lse McRae, S. D. Director. 

Guy Henry Cox, Ph. D,, E. M. .Geology and Mineralogy. 

Carroll Ralph Forbes, E. M. Mining. 

Victor Hugo Gottschalk, M. S. Chemistry. 

Horace Tharp Mann, E. M. Metallurgy and Ore Dressing. 

Martin Harmon Thornberry, B. S. .. .Research Assistant. 

Robert John Anderson, B. S. Research Assistant. 

Carl GodfriEd Stifel. Research Assistant. 

William Kennedy Hunter, A. B. Flotation Expert. 

The Mining Experiment Station was established June 1, 1909.’ 

It is the object of the Station to conduct such original researches 
or to verify such experiments as relate to the properties and uses of 
mineral products; to investigate the engineering problems connected 
with the mineral industry, the economic methods of mining and the 
preparation of mineral products, the methods of preventing waste of 
the mineral resources and the methods of preventing accidents in mines, 
mills, and smelters; to assist in improving the conditions surrounding 
the labor in mines, mills, and smelters; and such other researches or 
experiments as bear directly upon the application of mining and metal¬ 
lurgical engineering to the mineral industry of the State of Missouri. 

Any resident of the State may on request obtain bulletins as issued, 
or if particularly interested, may be placed on the regular mailing list. 
Correspondence regarding these bulletins or the work of the Station 
may be addressed to the Director, ?vlining Experiment Station, Rolla, 
Missouri. - 











SCHOOL OF MINES 
AND METALLURGY 

UNIVERSITY OF MISSOURI 


CUPELLATION LOSSES IN ASSAYING 

BY 

HORACE THARP MANN 

Associate Professor of Metallurgy and Ore Dressing, and 

CHARLES YANCEY CLAYTON 

Assistant Professor of Ore Dressing and Metallurgy 


ROLLA. MISSOURI 
1916 





r) ^ 




METALLURGY AND ORE DRESSING 
















DEPARTMENT OF METALLURGY AND ORE DRESSING. 


Durward Copeland............ 

Horace Tharp Mann.. Associate 

Charles Yancey Clayton...... Assistant 

Robert John Anderson__________ 

Robert Stanley Rurg.........Student 

Clarence Eugene Peterson. Student 


. E^rofessor 
Professor 
Professor 
Instructor 
A ssistant 
Assistant 


J. \\b Parley 


Committee on Publications. 

G. H. Cox C. Y. Clavton 










ASSAY LABORATORY 

















TABLE OF CONTENTS. 


Page 

^Method of operation.:. 7 

Screen analysis of bone ash. 8 

Losses due to composition of cupels. 8 

Effect of moisture and hardness. 36 

Effect of surface condition of cupel. 40 

Slag losses . 51 









FOREWORD. 


Professor H. T. Mann while a student became interested in 
losses in assaying and worked out an undergraduate thesis on cupel- 
lation losses. Later he had a number of students work theses on the 
same subject. The data given in tables 1 to 9, inclusive, is from the 
theses of James A. Taggart and Anton F. Karte. The balance of the 
work on cupellation losses is Professor Mann’s. The slag losses 
is the work of Professor Clayton. 



BULLETIN 

OF THE 

School of Mines and Metallurgy 

UNIVERSITY OF MISSOURI 

TECHNICAL SERIES 


Vol. II FEBRUARY I9l6 No. 3 


Method of Operation. 

In the separation of gold and silver from lead by cupellation 
there is more or less loss of the precious metals. The amount of 
this loss is dependant on a number of variables, such as temperature, 
material of which the cupels are made, impurities, etc. The follow¬ 
ing experiments were carried out to determine the effect of these 
variables under conditions which will permit large quantities of work 
being handled daily. 

The method of carrying out the work was as follows: A 
weighed amount of silver foil was wrapped in lead foil, the lead foil 
being weighed to the nearest half gram. If impurities, such as cop¬ 
per, zinc and tin were used, the material was weighed and added to 
the silver foil—lead foil button. Frequent analyses of all materials 
were made for gold and silver. The buttons were cupelled in the 
muffle of a gasoline furnace. Each run consisted of five rows across 
the muffle, each row containing six cupels. The first row was 
placed about three inches from the front of the muffle. The cupels 
were heated to a temperature of about 925°C to 950°C and then the 
buttons were placed in them. No buttons were placed in the first 
row of cupels, this row being used as a shield to protect the balance 
of the work from any chilling caused by the draft of cold air into the 
muffle. As soon as the buttons were in the cupels, the muffle doors 
were closed until the buttons were all opened. The doors were then 
removed and the temperature of the cupellations lowered by reduc¬ 
ing the muffle temperature, also by '“coolers” placed in the muffle. 
The temperature was held, where possible, so that feathers of 
litharge were formed in a continuous ring around the cupel. This 
temperature was maintained as nearly as possible until one minute 
before the blick when the ‘“coolers” were taken out of the muffle 
and the furnace temperature raised so that the cupellations were 
finished at a temperature between 850°C and 900°C. Where tem¬ 
peratures are given, the measurements were taken with a platinum- 
platinum rhodium couple and potentiometer; the conditions and 
the manner of the taking of the measurements stated in the body 
of the article. 




8 


MISSOURI SCHOOL OF MINLS. 


Screen Analysis. 

The boneash used for all laboratory cupels gave the following 
screen analysis: 


On 


Thru 



Size Opening. 

Per 

Screen. 

Inches. 

Cent. 

28 mesh 

.0232 

0.00 

35 “ 

.0164 

0.10 

48 “ 

.0116 

5.30 

65 “ 

.0082 

14.20 

100 “ 

.0058 

22.50 

150 “ 

.0041 

9.30 

200 “ 

.0029 

16.20 

220 “ 

• • • • 

0.20 

240 “ 

• • • • 

5.20 

260 “ 

• • • • 

5.30 

260 “ 

.... 

21.70 



100.00 


1. Losses in Cupellation When Using Different Materials 

for Cupels. 

The following materials were used for making cupels: 

1. Boneash. 

2. A mixture of one-half cement and one-half boneash. 

3. Cement base with a boneash top. 

4. Cement. 

5. Morganite cupel. 

6. Braunite cupel. 

7. Patented cupel No. 1. 

8. Patented cupel No. 2. 

9. Patented cupel No. 3. 

The charge for each cupel was 20 grams of lead foil and 20 milligrams of 
silver foil. The lead was weighed to the nearest halfgram and the silver was 
between 20.00 and 20.05 milligrams. 


Table No. 1. 
BONEASH CUPELS 


Top 

Temperature 

Bottom Average 

Time 

Weight 

Silver 

Loss 

% Loss 

7-10 

704 

707 

22 

19.90 

. 10 

0.5 

714 

708 

711 

20 

19.88 

. 12 

0.6 

715 

707 

711 

21 

19.88 

. 12 

0.6 

715 

707 

711 

23 

19.88 

. 12 

0.6 

709 

705 

707 

23 

19.86 

. 14 

0.7 

708 

706 

707 

22 

19.86 

. 14 

0.7 

725 

721 

723 

20 

19.84 

.16 

0.8 

726 

720 

723 

21 

19.84 

.16 

0.8 

726 

720 

723 ■ 

23 

19.84 

.16 

0.8 

725 

721 

723 

22 

19.84 

. 16 

0.8 

733 

721 

727 

20 

19.82 

. 18 

0.9 

733 

721 

727 

23 

19.82 

. 18 

0.9 

731 

731 

731 

23 

19.80 

.20 

1.0 

739 

731 

735 

22 

19.78 

.22 

1.1 

735 

735 

735 

27 

19.78 

.22 

1.1 







747 

744 

747 

747 

772 

752 

746 

750 

751 

757 

756 

757 

753 

755 

754 

751 

763 

760 

766 

770 

770 

774 

768 

768 

769 

760 

769 

771 

771 

770 

785 

781 

779 

783 

781 

781 

782 

788 

794 

795 

792 

794 

789 

790 

792 

797 

799 

799 

798 

810 

810 

817 

831 

832 

830 


MISSOURI SCHOOL OL MINKS. 


9 


BONEASH CUPELS—Contd. 


Temperature Silver 

Time 


Bottom 

Average 


Weight 

Loss 

% Loss 

747 

747 

24 

19.74 

.26 

1.3 

750 

747 

23 

19.74 

.26 

1.3 

747 

747 

22 

19.74 

.26 

1.3 

747 

747 

22 

19.74 

.26 

1.3 

764 

768 

22 

19.72 

.28 

1.4 

746 

748 

23 

19.72 

.28 

1.4 

752 

749 

23 

19.72 

.28 

1.4 

752 

751 

22 

19.70 

.30 

1.5 

751 

751 

20 

19.70 

.30 

1.5 

757 

757 

22 

19.68 

.32 

1.6 

758 

757 

22 

19.68 

.32 

1.6 

757 

757 

20 

19.68 

.32 

1.6 

761 

757 

27 

19.68 

.32 

1.6 

759 

757 

21 

19.68 

.32 

1.6 

760 

757 

22 

19.66 

.34 

1.7 

751 

751 

22 

19.66 

.34 

1.7 

767 

765 

22 

19.64 

.36 

1.8 

770 

765 

20 

19.64 

.36 

1.8 

764 

765 

23 

19.64 

.36 

1.8 

760 

765 

24 

19.64 

.36 

1.8 

766 

768 

22 

19.62 

.38 

1.9 

762 

768 

27 

19.62 

.38 

1.9 

768 

768 

23 

19.62 

.38 

1.9 

768 

768 

24 

19.62 

.38 

1.9 

767 

768 

24 

19.62 

.38 

1.9 

776 

768 

22 

19.62 

.38 

1.9 

767 

768 

21 

19.62 

.38 

1.9 

771 

771 

24 

19.60 

.40 

2.0 

771 

771 

21 

19.60 

.40 

2.0 

780 

775 

23 

19.58 

.42 

2.1 

773 

779 

21 

19.56 

.44 

2.2 

777 

779 

22 

19.56 

.44 

2.2 

779 

779 

22 

19.56 

.44 

2.2 

779 

781 

22 

19.54 

.46 

2.3 

781 

781 

27 

19.54 

.46 

2.3 

781 

781 

23 

19.54 

.46 

2.3 

780 

781 

21 

19.54 

.46 

2.3 

782 

785 

22 

19.52 

.48 

2.4 

784 

789 

20 

19.50 

.50 

2.5 

783 

789 

20 

19.50 

.50 

2.5 

784 

788 

23 

19.50 

.50 

2.5 

784 

789 

21 

19.50 

. 50 

2.5 

789 

789 

22 

19.50 

.50 

2.5 

788 

789 

22 

19.50 

.50 

2.5 

790 

791 

27 

19.48 

.52 

2.6 

793 

795 

22 

19.46 

.54 

2.7 

799 

799 

16 

19.44 

.56 

2.8 

799 

799 

28 

19.44 

.56 

2.8 

792 

795 

16 

19.42 

.58 

2.9 

800 

805 

24 

19.40 

.60 

3.0 

800 

805 

24 

19.40 

.60 

3.0 

813 

815 

22 

19.34 

.66 

3.3 

831 

831 

16 

19.20 

.80 

4.0 

831 

831 

22 

19.20 

.80 

4.0 

844 

837 

28 

19.18 

.82 

4.1 









10 


MISSOURI SCIIOOU OF MINKS. 


BONEASH CUPELS—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

840 

834 

837 

23 

19.18 

.82 

4.1 

850 

836 

843 

16 

19.14 

.86 

4.3 

846 

840 

843 

16 

19.14 

.86 

4.3 

849 

841 

845 

23 

19.12 

.88 

4.4 

845 

845 

845 

23 

19.12 

.88 

4.4 

850 

860 

855 

28 

19.04 

.96 

4.8 

860 

850 

855 

20 

19.04 

.96 

4.8 

855 

855 

855 

25 

19.04 

.96 

4.8 

859 

855 

857 

21 

19.02 

.98 ■ 

4.9 

860 

854 

857 

25 

19.02 

.98 

4.9 

859 

855 

857 

30 

19.02 

.98 

4.9 

864 

854 

859 

22 

19.00 

1.00 

5.0 

860 

858 

859 

27 

19.00 

1.00 

5.0 

869 

861 

865 

23 

18.94 

1.06 

5.3 

872 

866 

869 

22 

18.90 

1.10 

5.5 

872 

866 

869 

23 

18.90 

1.10 

5.5 

884 

874 

879 

28 ■ 

18.76 

1.24 

6.2 

883 

883 

883 

24 

18.72 

1.28 

6.4 

889 

877 

883 

22 

18.72 

1.28 

6.4 

890 

876 

883 

24 

18.72 

1.29 

6.4 

886 

884 

885 

23 

18.70 

1.30 

6.5 

897 

877 

887 

21 

18.68 

1.32 

6.6 

890 

888 

889 

22 

18.68 

1.32 

6.6 

889 

889 

889 

26 

18.66 

1.34 

6.7 

890 

889 

889 

23 

18.64 

1.36 

6.8 

903 

899 

901 

21 

18.50 

1.50 

7.5 

905 

905 

905 

20 

18.42 

1.58 

7.9 

909 

905 

907 

26 

18.40 

1.60 

8.0 

911 

911 

911 

22 

18.32 

1.68 

8.4 

915 

911 

913 

23 

18.30 

1.70 

8.5 

918 

908 

913 

23 

18.28 

1.72 

8.6 

929 

914 

917 

20 

18.22 

1.78 

8.9 

930 

928 

929 

22 

18.C4 

1.96 

9.8 

930 

926 

928 

23 

18.04 

1.96 

9.8 

924 

918 

921 

23 

18.00 

2.00 

10.0 

924 

918 

921 

25 

18.00 

2.00 

10.0 

922 

920 

921 

24 

18.00 

2.00 

10.0 

936 

930 

933 

26 

17.94 

2.06 

10.3 

939 

939 

939 

24 

17.84 

2.16 

10.8 

948 

934 

941 

24 

17.80 

2.20 

11.0 

942 

938 

940 

23 

17.78 

2.22 

11.1 

941 

939 

940 

09 

17.78 

2.22 

11.1 

945 

941 

943 

25 

17.72 

2.28 

11.4 

946 

944 

945 

21 

17.68 

2.32 

11.6 

949 

945 

947 

20 

17.66 

2.34 

11.7 

949 

945 

947 

99 

17.64 

2.36 

11.8 

951 

951 

951 

21 

17.52 

2.48 

12.4 

960 

954 

957 

99 

17.50 

2.60 

13.0 

960 

958 

959 

21 

17.38 

2.62 

13.1 

765 

965 

965 

24 

17.20 

2.80 

14.0' 

969 

965 

967 

24 

17.16 

2.84 

14.2 

972 

970 

971 

27 

17.00 

3.00 

15.0 

974 

968 

971 

27 

17.00 

3.00 

15.0 

974 

968 

971 

26 

17.00 

3.00 

15.0 

975 

975 

975 

22 

16.86 

3.14 

15.7 






MISSOURI SCHOOL OF MINKS. 


11 


BONEASH CUPELS—Continued. 


Top 

Temperature 

Bottom 

Average 

Time 

W eight 

Silver 

Loss 

% Loss 

979 

975 

977 

26 

16.78 

3.22 

16.1 

984 

974 

979 

23 

16.74 

3.26 

16.3 

982 

976 

979 

23 

16.72 

3.28 

17.4 

990 

976 

979 

23 

16.46 

3.54 

17.7 

990 

980 

985 

25 

16.42 

3.58 

17.9 

990 

988 

989 

27 

16.32 

3.68 

18.4 

994 

988 

991 

24 

16.30 

3.70 

18.5 

997 

987 

997 

28 

16.04 

3.96 

19.8 




Table No. 

2 




HALF 

BONEASH AND HALF CEMENT 


1007 

1007 

1007 

27 

15.66 

4.32 

21.7 

1011 

1011 

1011 

24 

15.52 

4.48 

22.4 

1011 

1011 

1011 

22 

15.52 

4.48 

22.4 

700 

706 

703 

20 

19.84 

. 16 

0.8 

721 

713 

717 

23 

19.76 

.24 

1.2 

720 

720 

720 

21 

19.74 

.26 

1.3 

724 

716 

720 

23 

19.74 

.26 

1.3 

722 

718 

720 

22 

19.74 

.26 

1.3 

730 

728 

729 

21 

19.70 

.30 

1.5 

732 

726 

729 

23 

19.70 

.30 

1.5 

733 

725 

729 

99 

19.70 

.30 

1.5 

733 

725 

729 

21 

19.70 

.30 

1.5 

733 

731 

732 

23 

19.68 

.32 

1.6 

733 

731 

732 

23 

19.68 

.32 

1.6 

733 

731 

732 

22 

18.68 

.32 

1.6 

730 

740 

735 

22 

19.66 

.34 

1.7 

735 

735 

735 

21 

19.66 

.34 

1.7 

740 

736 

738 

21 

19.64 

.36 

1.8 

740 

736 

738 

21 

19.64 

.36 

1.8 

741 

735 

738 

22 

19.64 

.36 

1.8 

750 

730 

740 

21 

19.62 

.38 

1.9 

742 

738 

740 

22 

19.62 

.38 

1.9 

749 

741 

745 

21 

19.60 

.40 

2.0 

747 

743 

745 

21 

19.60 

.40 

2.0 

749 

741 

745 

23 

19.60 

.40 

2.0 

750 

748 

749 

21 

19.58 

.42 

2.1 

753 

745 

749 

23 

19.58 

.42 

2.1 

755 

747 

751 

• 23 

19.56 

.44 

2.2 

755 

747 

751 

22 

19.56 

.44 

O 9 

^ » w 

754 

748 

751 

21 

19.56 

.44 

2.2 

751 

751 

751 

22 

19.56 

.44 

2.2 

760 

750 

755 

22 

19.54 

.46 

2.3 

757 

753 

755 

21 

19.54 

.46 

2.3 

757 

753 

755 

21 

19.54 

.46 

2.3 

758 

752 

755 

21 

19.54 

.46 

2.3 

756 

754 

755 

21 

19.54 

..46 

2.3 

758 

752 

755 

23 

19.54 

.46 

2.3 

759 

755 

757 

21 

19.52 

.48 

2.4 

761 

761 

761 

22 

19.50 

.50 

2.5 

762 

760 

761 

21 

19.50 

.50 

2.5 

762 

760 

761 

21 

19.50 

.50 

2.5 

765 

757 

761 

23 

19.50 

.50 

2.5 

763 

759 

761 

23 

19.50 

.50 

2.5 

764 

758 

761 

23 

19.50 

.50 

2.5 









12 


MISOOURI SCHOOL OF MINKS. 


HALF BONEASH AND HALF CEMENT—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

767 

759 

763 

22 

19.48 

.52 

2.6 

7 65 

761 

763 

90 

19.48 

.52 

2.6 

766 

760 

763 

21 

19.48 

.52 

2.6 

770 

774 

772 

23 

19.46 

.54 

2.7 

767 

767 

767 

22 

19.46 

.54 

2.7 

770 

768 

769 

22 

19.44 

.56 

2.8 

772 

766 

769 

23 

19.44 

. 56 

2.8 

774 

772 

773 

20 

19.42 

.58 

2.9 

773 

773 

773 

20 

19.42 

.58 

2.9 

776 

774 

775 

20 

19.40 

.60 

3.0 


772 

775 

22 

19.40 

.60 

3.0 

/ / / 

773 

775 

21 

19.40 

.60 

3.0 

777 

773 

775 

21 

19.40 

.60 

3.0 

779 

771 

775 

21 

• 19.40 

.60 

3.0 

777 

777 

777 

20 

19.38 

.62 

3.1 

780 

774 

777 

21 

19.38 

.62 

3.1 

783 

775 

779 

21 

19.36 

.64 

3.2 

780 

778 

779 

21 

19.36 

. 64 

3.2 

785 

781 

783 

20 

19.34 

.66 

3.3 

788 

782 

785 

21 

19.32 

.68 

3.4 

791 

782 

787 

21 

19.30 

.70 

3.5 

796 

794 

795 

21 

19.26 

.74 

3.7 

797 

793 

795 

28 

19.26 

.74 

3.7 

799 

791 

795 

22 

19.26 

.74 

3.7 

798 

792 

795 

21 

19.26 

.74 

3.7 

800 

798 

799 

21 

19.22 

.78 

3.9 

803 

799 

801 

28 

19.20 

.80 

4.0 

809 

801 

805 

20 

19.16 

.84 

4.2 

811 

807 

809 

22 

19.12 

.88 - 

4.4 

814 

808 

811 

23 

19.10 

.90 

4.5 

814 

808 

811 

21 

19.10 

.90 

4.5 

823 

821 

822 

28 

19.02 

.98 

4.9 

823 

823 

823 

28 

19.00 

1.00 

5.0 

827 

819 

823 

23 

19.00 

1.00 

5.0 

836 

830 

833 

28 

18.90 

1 .10 

5.5 

836 

834 

835 

21 

18.88 

1.12 

5.6 

835 

835 

835 

30 

18.88 

1.12 

5.6 

839 

839 

839 

25 

18.86 

1.14 

o. V 

844 

842 

843 

22 

. 18.80 

1.20 

6.0 

844 

842 

843 

27 

18.80 

1.20 

6.0 

851 

847 

849 

20 

18.74 

1.26 

6.3 

857 

857 

857 

22 

18.66 

1.34 

6.7 

862 

856 

859 

21 

18.64 

1.36 

6.8 

881 

877 

879 

24 

18.40 

1.60 

8.0 

883 

885 

884 

21 

18.40 

1.60 

8.0 

886 

880 

883 

23 

18.32 

1.68 

8.4 

888 

882 

885 

26 

18.30 

1.70 

8.5 

900 

890 

895 

23 

18.20 

1.80 

9.0 

900 

898 

' 899 

21 

18.14 

1.86 

9.3 

902 

900 

901 

25 

18.12 

1.88 

9.4 

912 

906 

909 

24 

18.12 

1.88 

9.4 

907 

903 

905 

26 

18.06 

1.94 

9.7 

923 

919 

921 

23 

18.04 

1.96 

9.8 

912 

906 

909 

90 

18.00 

2.00 

10.0 

919 

915 

917 

22 

17.88 

2.12 

10.6 

925 

917 

921 

20 

17.84 

2.16 

10.8 









MISSOURI SCHOOL OF MINES. 


13 


HALF BONEASH AND HALF CEMENT—Contd. 


Top 

Temperature 


Time 


Silver 


Bottom 

Average 


Weight 

Loss 

% Loss 

925 

925 

925 

22 

17.76 

2.24 

11.2 

919 

919 

919 

23 

17.66 

2.34 

11.7 

924 

922 

923 

24 

17.62 

2.38 

11.9 

937 

933 

935 

23 

17.60 

2.40 

12.0 

943 

939 

941 

24 

17.52 

2.48 

12.4 

950 

944 

947 

22 

17.44 

2.56 

12.8 

951 

943 

947 

23 

17.44 

2.56 

12.8 

960 

958 

959 

24 

17.40 

2.60 

13.0 

952 

950 

951 

21 

17.36 

2.64 

13.2 

951 

947 

949 

23 

17.34 

2.66 

13.3 

955 

955 

955 

22 

17.32 

2.68 

13.4 

960 

954 

957 

25 

17.26 

2.74 

13.7 

965 

957 

961 

22 

17.20 

2.80 

14.0 

966 

960 

963 

26 

17.18 

2.82 

14.1 

966 

960 

963 

25 

17.16 

2.84 

13.2 

969 

965 

967 

27 

17.10 

2.90 

14.5 

973 

969 

971 

26 

17.04 

2.96 

14.8 

988 

986 

987 

27 

16.70 

3.30 

16.5 

990 

988 

989 

21 

16.68 

3.32 

16.6 

991 

991 

991 

22 

16.64 

3.36 

16.8 

995 

995 

995 

28 

16.56 

3.44 

17.2 

1003 

1003 

1003 

24 

16.44 

3.56 

17.8 

1005 

1005 

1005 

20 

16.38 

3.62 

18.1 

1011 

1011 

1011 

27 

16.24 

3.76 

18.8 

1015 

1015 

1015 

21 

16.22 

3.78 

18.9 

1029 

1029 

1029 

25 

15.96 

4.04 

20.2 

1035 

1035 

1035 

23 

15.86 

4.14 

20.7 



Table 

No. 3 





CEMENT BASE 

WITH 

BONEASH 

TOP 


675 

675 

675 

22 

20.00 

.00 

0.0 

675 

675 

675 

19 

23.00 

.00 

0.0 

675 

675 

675 

90 

20.00 

. 00 

0.0 

675 

675 

675 

99 

20.00 

.00 

0.0 

679 

679 

679 

22 

19.96 

.04 

0.2 

695 

695 

695 

22 

19.92 

.08 

0.4 

723 

715 

719 

22 

19.86 

. 14 

0.7 

733 

729 

731 

22 

19.82 

. 18 

0.9 

731 

731 

731 

22 

19.82 

. 18 

0.9 

740 

730 

735 

22 

19.80 

.20 

1.0 

735 

735 

735 

2 ] 

19.80 

.20 

1.0 

7 47 

739 

743 

22 

19.76 

.24 

1.2 

750 

736 

743 

19 

19.76 

.24 

1.2 

755 

755 

755 

21 

19.72 

.28 

1.4 

761 

757 

759 

21 

19.70 

.30 

1.5 

759 

759 

759 

21 

19.70 

.30 

1.5 

760 

758 

759 

99 

19.70 

.30 

1.5 

765 

761 

763 

22 

19.68 

.32 

1.6 

770 

764 

767 

21 

19.66 

.34 

1.7 

770 

764 

767 

21 

19.66 

.34 

1.7 

780 

770 

775 

21 

19.64 

.36 

• 1.8 

780 • 

778 

779 

21 

19.62 

.38 

1.9 

784 

774 

779 

22 

19.62 

.38 

1.9 

784 

778 

781 

21 

19.60 

.40 

2.0 

784 

778 

781 

22 

19.60 

.40 

2.0 











14 


MISSOURI SCHOOL OF MINES. 


CEMENT BASE WITH BONEASH TOP—Contd. 


Tod 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

784 

778 

781 

19 

19.60 

.60 

2.0 

790 

772 

781 

19 

19.60 

.40 

2.0 

780 

782 

781 

22 

19.60 

.40 

2.0 

805 

801 

803 

21 

19.60 

.40 

2.0 

810 

796 

803 

21 

19.60 

.40 

2.0 

793 

781 

787 

19 

19.58 

.42 

2.1 

794 

788 

791 

21 

19.56 

.44 

2.2 

790 

784 

787 

28 

19.56 

.44 

2.2 

797 

785 

791 

23 

19.56 

.44 

2.2 

796 

790 

793 

19 

19.54 

.46 

2.3 

793 

793 

793 

22 

19.54 

.46 

2.3 

799 

788 

793 

22 

19.54 

.46 

2.3 

793 

793 ■ 

793 

22 

19.54 

.46 

2.3 

807 

799 

803 

21 

19.54 

.46 

2.3 

796 

794 

795 

22 

19.52 

.48 

2.4 

800 

798 

799 

23 

19.50 

.50 

2.5 

800 

798 

799 

21 

19.50 

.50 

2.5 

800 

786 

793 

21 

19.50 

.50 

2.5 

805 

801 

803 

21 

19.48 

.52 

2.6 

788 

774 

781 

21 

19.48 

.52 

2.6 

772 

790 

781 

23 

19.48 

.52 

2.6 

807 

807 

807 

21 

19.46 

.54 

2.7 

812 

810 

811 

19 

19.44 

.56 

2.8 

814 

808 

811 

22 

19.42 

.58 

2.9 

811 

811 

811 

21 

19.42 

.58 

2.9 

816 

814 

815 

22 

19.40 

.60 

3.0 

819 

815 

817 

21 

19.38 

.62 

3.1 

818 

816 

817 

23 

19.38 

.62 

3.1 

825 

821 

823 

21 

19.36 

.64 

3.2 

825 

821 

823 

21 

19.36 

.64 

3.2 

826 

820 

623 

21 

19.36 

. 64 

3.2 

828 

822 

825 

23 

19.34 

.66 

3.3 

832 

830 

831 

19 

19.32 

.68 

3.4 

833 

829 

831 

23 

19.32 

.68 

3.4 

837 

• 837 

837 

23 

19.26 

.74 

3.7 

850 

832 

841 

21 

19.24 

.76 

3.8 

844 

838 

841 

28 

19.24 

.76 

3.8 

850 

840 

835 

28 

19.22 

.78 

3.9 

847 

843 

845 

22 

19.22 

.78 

3.9 

847 

843 

845 

22 

19.22 

.78 

3.9 

850 

844 

847 

21 

19.20 

.80 

4.0 

847 

847 

847 

22 

19.20 

.80 

4.0 

852 

850 

851 

23 

19.18 

.82 

4.1 

853 

849 

851 

23 

19.18 

.82 

4.1 

856 

854 

855 

21 

19.16 

.84 

4.2 

856 

854 

855 

22 

19.16 

.84 

4.2 

857 

853 

855 

21 

19.16 

.84 

4.2 

860 

854 

857 

21 

19.14 

.86 

4.3 

868 

858 

863 

21 

19.10 

.90 

4.5 

866 

860 

863 

21 

19.10 

.90 

4.5 

873 

869 

871 

27 

19.04 

.96 

4.8 

875 

868 

871 

22 

19.04 

.96 

4.8 

876 

875 

875 

21 

19.00 

1.00 

■ 5.0 

877 

873 

875 

25 

19.00 

1.00 

5.0 

878 

872 

875 

28 

19.00 

1.00 

5.0 

875 

875 

875 

28 

19.00 

1.00 

5.0 





MISSOURI SCHOOL OF MINKS. 


15 



CEMENT 

BASE 

WITH BONEASH TOP- 

—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

876 

874 

875 

26 

19.00 

1.00 

5.0 

883 

879 

881 

25 

18.96 

1.04 

5.2 

887 

883 

885 

23 

18.92 

1.08 

5.4 

900 

890 

895 

22 

18.80 

1.20 

6.0 

900 

892 

891 

22 

18.74 

1.26 

6.3 

900 

910 

905 

21 

18.70 

1.30 

6.5 

913 

909 

911 

21 

18.64 

1.36 

6.8 

915 

907 

911 

21 

18.64 

1.36 

6.8 

914 

907 

911 

23 

18.64 

1.36 

6.8 

924 

918 

921 

30 

18.54 

1.46 

7.3 

925 

925 

925 

25 

18.50 

1.50 

7.5 

925 

925 

925 

26 

18.50 

1.50 

7.5 

929 

925 

927 

21 

18.48 

1.52 

7.6 

930 

928 

929 

24 

18.46 

1.54 

7.7 

934 

932 

933 

22 

18.42 

1.04 

7.9 

948 

942 

945 

21 

18.24 

1.76 

8.8 

948 

942 

945 

21 

18.24 

1.76 

8.8 

949 

945 

947 

20 

18.20 

1.80 

9.0 

950 

948 

949 

23 

18.18 

1.82 

9.1 

955 

955 

955 

27 

18.10 

1.90 

9.5 

963 

954 

959 

20 

18.40 

1.96 

9.8 

952 

950 

951 

23 

18.02 

1.98 

9.9 

954 

948 

951 

23 

18.02 

1.98 

9.9 

964 

960 

962 

25 

18.00 

2.00 

10.0 

963 

959 

961 

24 

17.98 

2.02 

10.1 

964 

962 

963 

23 

17.96 

2.04 

10.2 

964 ' 

962 

963 

23 

17.96 

2.04 

10.2 

970 

956 

963 

23 

17.96 

2.04 

10.2 

978 

972 

975 

22 

17.80 

2.20 

11.0 

979 

973 

976 

26 

17.78 

2.22 

11.1 

985 

977 

981 

28 

17.66 

2.34 

11.7 

989 

981 

985 

26 

17.56 

2.44 

12.2 

995 

995 

995 

22 

17.38 

2.62 

13.1 

995 

991 

993 

24 

17.34 

2.66 

13.3 

997 

997 

997 

26 

17.30 

2.70 

13.5 

998 

998 

998 

22 

17.28 

2.72 

13.6 

999 

999 

999 

23 

17.18 

2.82 

14.1 

1003 

1003 

1003 

21 

17.06 

2.94 

14.7 

1003 

1003 

1003 

25 

17.06 

2.94 

14.7 

1005 

1005 

1005 

21 

17.02 

2.98 

14.9 

1005 

1005 

1005 

24 

17.02 

2.98 

14.9 

1007 

1007 

1007 

23 

17.00 

3.00 

15.0 

1007 

1007 

1007 

22 

17.00 

3.00 

15.0 

1015 

1015 

1015 

27 

16.66 

3.34 

16.7 

1015 

1015 

1015 

28 

16.66 

3.34 

16.7 

1015 

1015 

1015 

22 

16.66 

3.34 

16.7 

1019 

1019 

1019 

27 

16.58 

3.42 

17.1 

1023 

1023 

1023 

22 

16.40 

3.60 

18.0 

1029 

1029 

1029 

24 

16.20 

3.80 

19.0 

1025 

1025 

1025 

27 

16.16 

3.84 

19.2 

1027 

1027 

1027 

21 

15.66 

4.34 

21.7 

1021 

1021 

1021 

22 

15.50 

4.50 

22.5 

1035 

1035 

1035 

25 

15.54 

4.46 

22.3 

1035 

1035 

1035 

24 

15.34 

4.66 

23.3 

1035 

1035 

1035 

24 

15.06 

4.94 

24.7 

1035 

1035 

1035 

22 

15.08 

4.92 

24.6 







16 


MISSOURI SCHOOL OF MINES. 


Table No. 4 
CEMENT CUPEL 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

699 

699 

699 

21 

19.84 

. 16 

0.8 

710 

700 

705 

20 

19.78 

.22 

1.1 

720 

702 

711 

22 

19.74 

.26 

1.3 

711 

711 

711 

20 

19.74 

.26 

1.3 

720 

714 

717 

22 

19.70 

.30 

1.5 

717 

717 

717 

21 

19.70 

.30 

1.5 

722 

716 

719 

22 

19.68 

.32 

1.6 

724 

714 

719 

22 

19.68 

.32 

1.6 

722 

716 

719 

22 

19.68 

.32 

1.6 

719 

719 

719 

20 

19.68 

.32 

1.6 

724 

718 

721 

22 

19.66 

.34 

1.7 

721 

721 

721 

20 

19.66 

.34 

1.7 

724 

718 

721 

20 

19.66 

.34 

1.7 

726 

716 

721 

22 

19.66 

.34 

1.7 

726 

720 

723 

22 

19.64 

.36 

1.8 

728 

718 

723 

22 

19.64 

.36 

1.8 

723 

723 

723 

22 

19.64 

.36 

1.8 

730 

724 

727 

21 

19.62 

.38 

1.9 

730 

724 

727 

22 

19.62 

.38 

1.9 

732 

726 

729 

21 

19.60 

.40 

2.0 

729 

729 

729 

22 

19.60 

.40 

2.0 

732 

728 

729 

22 

19.60 

.40 

2.0 

734 

728 

732 

21 

19.58 

.42 

2.1 

7T6 

728 

732 

21 

19.58 

.42 

2.1 

736 

730 

733 

22 

19.56 

.44 

2.2 

736 

730 

733 

20 

19.56 

.44 

2.2 

740 

730 

735 

22 

19.54 

.46 

2.3 

735 

735 

735 

22 

19.54 

.46 

2.3 

738 

732 

735 

21 

19.54 

.46 

2.3 

740 

734 

737 

21 

19.52 

.48 

2.4 

744 

730 

737 

20 

19.52 

.48 

2.4 

737 

737 

737 

21 

19.52 

.48 

2.4 

740 

734 

737 

21 

19.50 

.50 

2.5 

745 

735 

740 

22 

19.50 

.50 

2.5 

744 

736 

740 

20 

19.50 

.50 

2.5 

740 

740 

740 

21 

19.50 

.50 

2.5 

750 

740 

735 

25 

19.46 

.54 

2.7 

750 

744 

747 

25 

19.44 

.56 

2.8 

750 

744 

747 

25 

19.44 

.56 

2.8 

752 

746 

749 

25 

19.42 

.58 

2.9 

752 

751 

751 

21 

19.40 

.60 

3.0 

751 

751 

751 

21 

19.40 

.60 

3.0 

756 

746 

751 

20 

19.40 

.60 

3.0 

754 

748 

751 

22 

19.40 

.60 

3.0 

7 56 

750 

753 

25 

19.38 

.62 

3.1 

758 

750 

753 

25 

19.38 

.62 

3.1 

758 

748 

753 

22 

19.38 

.62 

3.1 

753 

753 

753 

22 

19.38 

.62 

3.1 

756 

740 

753 

20 

19.38 

.62 

3.1 

760 

750 

755 

25 

19.36 

.64 

3.2 

762 

748 

755 

21 

19.36 

.64 

3.2 

760 

750 

755 

22 

19.36 

.64 

3.2 

760 

754 

757 

31 

19.34 

.66 

3.3 







760 

757 

763 

762 

766 

759 

766 

766 

770 

772 

767 

770 

772 

772 

769 

780 

780 

783 

783 

790 

790 

792 

789 

789 

793 

800 

800 

810 

810 

815 

822 

819 

826 

830 

828 

830 

832 

829 

834 

834 

840 

835 

840 

842 

850 

850 

851 

851 

856 

855 

860 

860 

859 

864 

866 


5 

6 

8 

9 

9 

9 

0 

0 

0 

2 

4 

4 

5 

7 

9 

0 

0 

0 

0 

5 

6 

0 

2 

5 

8 

8 

0 

1 

1 

2 

6 

6 

6 

7 

9 

9 

0 

1 

7 

8 

1 

2 

2 

3 

1 


MISSOURI SCHOOL OF MINLS. 


CEMENT CUPEL—Contd. 


Temperature Silver 

Time 


Bottom 

Average 


Weight 

Loss 

754 

757 

20 

19.34 

.66 

757 

757 

99 

19.34 

.66 

751 

757 

22 

19.34 

.66 

756 

759 

20 

19.32 

.68 

752 

759 

21 

19.32 

.68 

759 

759 

21 

19.32 

.68 

756 

761 

21 

19.30 

.70 

760 

763 

22 

19.28 

.72 

764 

767 

21 

19.24 

.76 

762 

767 

24 

19.22 

.78 

767 

767 

22 

19.22 

.78 

764 

767 

22 

19.22 

.78 

766 

769 

21 

19.20 

.80 

766 

769 

28 

19.20 

.80 

769 

769 

25 

19.20 

.80 

770 

775 

20 

19.16 

.84 

776 

778 

22 

19.12 

.88 

779 

781 

22 

19.10 

.88 

779 

781 

22 

19.10 

.90 

780 

785 

25 

19.06 

.95 

784 

787 

28 

19.02 

.98 

787 

789 

20 

19.00 

1.00 

789 

789 

20 

19.00 

1.00 

789 

789 

23 

19.00 

1.00 

785 

789 

28 

19.00 

1.00 

794 

797 

21 

18.90 

1.10 

799 

799 

20 

18.80 

1.12 

800 

805 

25 

18.80 

1.20 

804 

807n 

23 

18.76 

1.24 

807 

811 

21 

18.70 

1.30 

816 

819 

22 

18.64 

1.36 

819 

819 

28 

18.64 

1.36 

816 

821 

27 

18.60 

1.40 

820 

825 

22 

18.58 

1.42 

822 

825 

23 

18.58 

1.42 

824 

827 

30 

18.56 

1.44 

826 

829 

25 

18.48 

1.52 

829 

829 

22 

18.48 

1.52 

824 

829 

23 

18.48 

1.52 

828 

831 

26 

18.46 

1.54 

830 

835 

26 

18.42 

1.58 

835 

835 

23 

18.42 

1.58 

834 

837 

22 

18.40 

1.60 

836 

839 

24 

18.38 

1.62 

840 

845 

23 

18.26 

1.74 

844 

847 

25 

18.24 

1.76 

847 

849 

20 

18.18 

1.82 

851 

851 

22 

18.16 

1.84 

846 

851 

21 

18.16 

1.84 

855 

855 

22 

18.14 

1.86 

854 

857 

23 

18.12 

1.88 

859 

859 

26 

18.06 

1.94 

859 

859 

20 

18.06 

1.94 

858 

861 

27 

18.04 

1.96 

856 

861 

24 

18.04 

1.96 







18 


MISSOURI SCHOOU OF MINKS. 


CEMENT CUPELS—C mtd. 


Temperature 

Top Bottom Average 

Time 

Weight 

Silver 

Loss 

% Loss 

861 

861 

861 

23 

18.02 

1.98 

9.9 

866 

858 

862 

23 

18.00 

2.00 

10.0 

864 

850 

862 

22 

18.00 

2.00 

10.0 

862 

862 

862 

23 

18.00 

2.00 

10.0 

866 

858 

862 

22 

18.00 

2.00 

10.0 

866 

860 

863 

20 

17.96 

2.04 

10.2 

863 

863 

863 

23. 

17.96 

2.04 

10.2 

866 

860 

863 

28 

17.96 

2.04 

10.2 

872 

866 

869 

22 

17.82 

^.18 

10.9 

880 

870 

875 

25 

17.74 

2.26 

11.3 

875 

875 

875 

26 

17.74 

2.26 

11.3 

880 

876 

878 

24 

17.68 

2.32 

11.6 

886 

880 

883 

21 

1 / . 55 

2.44 

12.2 

890 

880 

885 

22 

17.52 

2.48 

12.4 

885 

885 

885 

22 

17.52 

2.48 

12.4 

890 

880 

885 

23 

17.52 

2.48 

12.4 

890 

884 

887 

24 

17.50 

2.50 

12.5 

894 

888 

891 

27 

17.46 

2.54 

12.7 

896 

890 

893 

23 

17.44 

2.56 

12.8 

896 

886 

891 

21 

17.40 

2.60 

13.0 

900 

894 

897 

28 

17.28 

2.72 

13.6 

900 

899 

899 

24 

17.24 

2.76 

13.8 

906 

896 

901 

26 

17.22 

2.78 

13.9 

901 

901 

901 

21 

17.22 

2.78 

13.9 

910 

900 

905 

28 

17.16 

2.84 

14.2 

912 

906 

909 

21 

17.10 

2.90 

14.5 

912 

912 

912 

22 

17.00 

3.00 

15.0 

918 

912 

915 

25 

16.92 

3.08 

15.4 

924 

918 

921 

27 

16.80 

3.20 

16.0 

926 

920 

923 

22 

16.78 

3.22 

16.1 

930 

920 

925 

24 

16.74 

3.26 

16.3 

960 

959 

959 

28 

16.12 

3.88 

19.4 

964 

958 

961 

24 

16.08 

3.92 

19.6 

968 

962 

965 

25 

16.04 

3.96 

19.8 




Table No 

. 5 





MORGANITE 

CUPELS 



775 

775 

775 

22 

20.00 

.00 

0.0 

775 

775 

/ / o 

30 

20.00 

.00 

0.0 

776 

774 

775 

30 

20.00 

.00 

0.0 

777 

773 

775 

30 

20.00 

.00 

0.0 

778 

772 

775 

30 

20.00 

.00 

0.0 

776 

774 

775 

30 

20.00 

.00 

0.0 

776 

774 

775 

23 

20.00 

.00 

0.0 

776 

774 

775 

23 

20.00 

.00 

0.0 

778 

772 

775 

23 

20.00 

.00 

0.0 

779 

771 

775 

23 

20.00 

.00 

0.0 

775 

775 

775 

25 

20.00 

.00 

0.0 

778 

772 

772 

22 

20.00 

.00 

0.0 

795 

788 

791 

22 

19.98 

.02 

0.0 

794 

788 

791 

23 

19.98 

.02 

0.1 

822 

821 

821 

23 

19.94 

.06 

0.3 

831 

831 

831 

25 

19.92 

.08 

0.4 














MISSOURI SCHOOU OF MINES. 


19 


MORGANITE CUPELS—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

848 

846 

847 

22 

19.90 

. 10 

0.5 

849 

845 

847 

22 

19.90 

.10 

0.5 

849 

845 

847 

22 

19.90 

. 10 

0.5 

848 

846 

847 

22 

19.90 

. 10 

0.5 

854 

847 

851 

30 

19.88 

. 12 

0.6 

853 

859 

851 

23 

19.88 

. 12 

0.6 

852 

850 

851 

25 

19.88 

. 12 

0.6 

865 

861 

863 

30 

19.86 

. 14 

0.7 

863 

863 

863 

30 

19.88 

. 14 

0.7 

865 

861 

863 

23 

19.86 

. 14 

0.7 

863 

863 

863 

23 

19.86 

.14 

0.7 

870 

864 

867 

28 

19.84 

. 16 

0.8 

878 

874 

876 

23 

19.84 

. 16 

0.8 

867 

867 

867 

23 

19.84 

. 16 

0.8 

877 

873 

875 

28 

19.82 

.18 

0.9 

879 

871 

875 

25 

19.82 

. 18 

0.9 

875 

875 

875 

22 

19.82 

. 18 

0.9 

880 

878 

879 

23 

19.80 

.20 

1.0 

881 

877 

879 

27 

19.80 

.20 

1.0 

882 

876 

879 

30 

19.80 

.20 

1.0 

881 

877 

879 

23 

19.80 

.20 

1.0 

882 

876 

879 

25 

19.80 

.20 

1.0 

888 

886 

887 

23 

19.78 

.22 

1.1 

889 

885 

887 

23 

19.78 

.22 

1.1 

893 

889 

891 

28 

19.76 

.24 

1.2 

894 

888 

891 

30 

19.76 

.24 

1.2 

892 

890 

891 

23 

19.76 

.24 

1.2 

892 

890 

891 

23 

19.76 

.24 

1.2 

897 

893 

895 

30 

19.74 

.26 

1.3 

896 

894 

895 

30 

19.74 

.26 

1.3 

899 

891 

895 

30 

19.74 

.26 

1.3 

895 

895 

895 

23 

19.74 

.26 

1.3 

898 

892 

895 

23 

19.74 

.26 

1.3 

899 

891 

895 

25 

19.74 

.26 

1.3 

906 

900 

903 

21 

19.72 

.28 

1.4 

906 

900 

903 

22 

19.72 

.28 

1.4 

910 

904 

907 

30 

19.70 

.30 

1.5 

911 

903 

907 

27 

19.70 

.30 

1.5 

907 

907 

907 

27 

19.70 

.30 

1.5 

909 

905 

907 

25 

19.70 

.30 

1.5 

915 

907 

911 

22 

19.68 

.32 

1.6 

912 

910 

911 

22 

19.68 

.32 

1.6 

914 

908 

911 

27 

19.68 

.32 

1.6 

913 

909 

911 

22 

19.68 

.32 

1.6 

916 

914 

915 

27 

19.66 

.34 

1.7 

917 

913 

915 

30 

19.66 

.34 

1.7 

915 

915 

915 

22 

19.66 

.34 

1.7 

918 

912 

915 

22 

19.66 

.34 

1.7 

919 

919 

919 

22 

19.64 

.36 

1 .8 

920 

918 

919 

22 

19.64 

.36 

1.8 

920 

918 

919 

22 

19.64 

.36 

1.8 

923 

923 

923 

22 

19.62 

.38 

1.9 

925 

921 

923 

22 

19.62 

.38 

1.9 

930 

924 

927 

24 

19.60 

.40 

2.0 

929 

925 

927 

25 

19.60 

.40 

2.0 










20 


MISSOURI SCHOOL OF MINES. 


MORGANITE CUPELS—Contd. 


Top 

Pemperature 

Bottom Average 

Time 

Weight 

Silver 

Loss 

% Loss 

931 

923 

927 

22 

19.60 

.40 

2.0 

932 

930 

931 

24 

19.58 

.42 

2.1 

932 

929 

931 

22 

19.58 

.42 

2.1 

931 

931 

931 

24 

19.58 

.42 

2.1 

932 

930 

931 

27 

19.58 

.42 

2.1 

934 

928 

931 

22 

19.58 

.42 

2.1 

939 

931 

935 

21 

19.56 

.44 

2.2 

941 

937 

939 

22 

19.54 

.46 

2.3 

940 

938 

939 

22 

19.54 

.46 

2.3 

945 

941 

943 

24 

19.52 

.48 

2.4 

946 

940 

943 

24 

19.52 

.48 

2.4 

945 

941 

943 

24 

19.52 

.48 

2.4 

950 

944 

947 

22 

19.50 

.50 

2.5 

947 

947 

947 

22 

19.50 

.50 

2.5 

947 

947 

947 

24 

19.48 

.52 

2.6 

947 

947 

947 

27 

19.48 

.52 

2.6 

956 

954 

955 

27 

19.44 

.56 

2.8 

959 

951 

955 

24 

19.44 

.56 

2.8 

961 

957 

959 

22 

19.40 

.60 

3.0 

960 

958 

959 

28 

19.40 

.60 

3.0 

961 

951 

959 

28 

19.40 

.60 

3.0 

959 

959 

959 

24 

19.40 

.60 

3.0 

966 

960 

963 

26 

19.38 

.62 

3.1 

965 

961 

963 

28 

19.36 

.64 

3.2 

979 

973 

976 

30 

19.36 

.64 

3.2 

964 

962 

963 

25 

19.36 

.64 

3.2 

968 

966 

967 

20 

19.34 

.66 

3.3 

971 

971 

971 

25 

19.30 

.70 

3.5 

973 

969 

971 

24 

19.30 

.70 

3.5 

976 

974 

975 

20 

19.28 

.72 

3.6 

978 

972 

975 

22 

19.28 

.72 

3.6 

983 

975 

979 

23 

19.24 

.76 

3.8 

982 

976 

979 

20 

19.24 

.76 

3.8 

979 

979 

979 

24 

19.24 

.76 

3.8 

986 

980 

983 

22 

19.22 

.78 

3.9 

987 

979 

983 

23 

19.22 

.78 

3.9 

987 

980 

983 

23 

19.20 

.80 

4.0 

985 

985 

985 

25 

19.18 

.82 

4.1 

988 

986 

987 

26 

19.16 

.84 

4.2 

983 

979 

981 

22 

19.14 

.86 

4.3 

992 

990 

991 

23 

19.12 

.88 

4.4 

995 

995 

995 

27 

19.10 

.90 

4.5 

995 

995 

995 

25 

19.08 

.92 

4.6 

997 

997 

997 

22 

19.06 

.94 

4.7 

997 

997 

997 

22 

19.06 

.94 

4.7 

999 

999 

999 

21 

19.04 

.96 

4.8 

999 

999 

999 

24 

19.04 

.96 

4.8 

999 

999 

999 

21 

19.04 

.96 

4.8 

1003 

1003 

1003 

23 

19.02 

.98 

4.9 

1003 

1003 

1003 

24 

19.02 

.98 

4.9 

1003 

1003 

1003 

26 

19.00 

1.00 

5.0 

1003 

1003 

1003 

25 

19.00 

1.00 

5.0 

1003 

1003 

1003 

27 

19.00 

1.00 

5.0 

1003 

1003 

1003 

24 

19.00 

1.00 

5.0 

1003 

1003 

1003 

23 

19.00 

1.00 

5.0 







MISSOURI SCIIOOU OF MINKS. 


21 


AIORGANITE CUPELS—Cont. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

1003 

1003 

1003 

24 

19.00 

1.00 

5.0 

1003 

1003 

1003 

22 

19.00 

1.00 

5.0 

1007 

1007 

1007 

27 

18.96 

1.04 

5.2 

1007 

1007 

1007 

25 

18.94 

1.06 

5.3 

1007 

1007 

1007 

22 

18.94 

1.06 

5.3 

1009 

1009 

1009 

25 

18.92 

1.08 

5.4 

1013 

1013 

1013 

22 

18.86 

1.14 

5.7 

1015 

1015 

1015 

24 

19.84 

1.16 

5.8 

1027 

1019 

1023 

23 

19.72 

1.28 

6.4 

1023 

1023 

1023 

23 

18.72 

1.28 

6.4 

1027 

1027 

1027 

27 

18.64 

1.36 

6.8 

1029 

1029 

1029 

21 

18.62 

1.38 

6.9 

1029 

1029 

1029 

28 

18.62 

1.38 

6.9 




Table No. 

6 





BRAUNITE CUPEL 



73S 

732 

735 

22 

20.00 

.00 

0.0 

725 

735 

735 

22 

20.00 

.00 

0.0 

738 

732 

735 

24 

20.00 

.00 

0.0 

740 

730 

735 

24 

20.00 

.00 

0.0 

735 

735 

735 

24 

20.00 

.00 

0.0 

740 

730 

735 

24 

20.00 

.00 

0.0 

740 

738 

739 

22 

19.96 

.04 

0.2 

742 

736 

739 

24 

19.96 

.04 

0.2 

739 

739 

739 

25 

19.96 

.04 

0.2 

739 

739 

739 

24 

19.96 

.04 

0.2 

750 

744 

747 

24 

19.94 

.06 

0.3 

747 

747 

747 

24 

19.94 

.06 

0.3 

760 

750 

755 

22 

19.92 

.08 

0.4 

755 

755 

755 

22 

19.92 

.08 

0.4 

766 

760 

763 

22 

19.90 

. 10 

0.5 

770 

760 

765 

23 

19.88 

.12 

0.6 

768 

762 

765 

22 

19.88 

. 12 

0.6 

768 

762 

765 

23 

19.88 

.12 

0.6 

776 

770 

773 

23 

19.86 

. 14 

0.7 

780 

770 

775 

22 

19.84 

.16 

0.8 

778 

772 

775 

24 

19.84 

.16 

0.8 

775 

775 

775 

22 

19.84 

.16 

0.8 

780 

770 

775 

23 

19.84 

.16 

0.8 

778 

772 

773 

24 

19.84 

.16 

0.8 

785 

781 

737 

22 

19.82 

.18 

0.9 

788 

779 

858 

23 

19.82 

.18 

0.9 

790 

784 

787 

24 

19.80 

.20 

1.0 

790 

784 

787 

23 

19.80 

.20 

1.0 

802 

796 

799 

22 

19.76 

.24 

1.2 

799 

796 

799 

23 

19.76 

.24 

1.2 

804 

794 

799 

23 

19.76 

.24 

1.2 

799 

799 

799 

23 

19.76 

.24 

1.2 

806 

800 

803 

2^ 

19.74 

.26 

1.3 

810 

804 

807 

22 

19.72 

.28 

1.4 

809 

805 

807 

22 

19.72 

.28 

1.4 

807 

807 

807 

22 

19.72 

.28 

1.4 

816 

808 

812 

24 

19.70 

.30 

1.5 








22 


MISSOURI SCHOOL OF MINES. 


BRAUNITE CUPEL—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

812 

812 

812 

22 

19.70 

.30 

1.5 

818 

806 

812 

23 

19.70 

.30 

1.5 

812 

812 

812 

23 

19.70 

.30 

1.5 

81.5 

809 

812 

23 

19.70 

.30 

1.5 

820 

804 

812 

23 

19.70 

.30 

1.5 

812 

812 

812 

23 

19.70 

.30 

1.5 

820 

810 

815 

23 

19.68 

.32 

1.6 

815 

815 

815 

24 

19.68 

.32 

1.6 

826 

820 

823 

23 

19.66 

.34 

1.7 

828 

818 

823 

23 

19.66 

.34 

1.7 

827 

827 

827 

23 

19.64 

.36 

1.8 

830 

824 

827 

23 

19.64 

.36 

1.8 

830 

824 

827 

23 

19.64 

.36 

1.8 

830 

828 

829 

23 

19.62 

.38 

1.9 

829 

829 

829 

23 

19.62 

.38 

1.9 

834 

824 

829 

23 

19.62 

.38 

1.9 

840 

830 

825 

23 

19.60 

.40 

2.0 

838 

832 

835 

23 

19.60 

.40 

2.0 

838 

832 

835 

23 

19.60 

.40 

2.0 

845 

841 

843 

23 

19.56 

.44 

2.2 

846 

840 

843 

23 

19.56 

.44 

2.2 

843 

843 

843 

23 

19.56 

.44 

2.2 

850 

844 

847 

23 

19.54 

.46 

2.3 

860 

850 

855 

23 

19.50 

.50 

2.5 

870 

864 

867 

23 

19.44 

.56 

2.8 

870 

864 

867 

23 

19.44 

.56 

2.8 

872 

870 

871 

28 

19.42 

.58 

2.9 

871 

871 

871 

23 

19.42 

.58 

2.9 

880 

870 

875 

28 

19.40 

.60 

3.0 

875 

875 

875 

20 

19.40 

.60 

3.0 

882 

868 

875 

23 

19.40 

.60 

3.0 

887 

887 

887 

28 

19.34 

.66 

3.3 

891 

883 

887 

24 

19.34 

.66 

3.3 

889 

885 

887 

23 

19.34 

.66 

3.3 

890 

886 

887 

23 

19.34 

.66 

3.3 

889 

885 

887 

23 

19.34 

.66 

3.3 

894 

888 

891 

25 

19.32 

.68 

3.4 

906 

900 

903 

23 

19.26 

.74 

3.7 

903 

903 

903 

28 

19.26 

.74 

3.7 

906 

892 

899 

21 

19.24 

.76 

3.8 

908 

890 

899 

25 

19.24 

.76 

3.8 

899 

899 

899 

23 

19.24 

.76 

3.8 

899 

899 

899 

23 

19.24 

. 75 

3.8 

920 

902 

911 

21 

19.20 

.80 

4.0 

914 

908 

911 

22 

19.20 

.80 

4.0 

916 

906 

911 

22 

19.20 

.80 

4.0 

920 

902 

911 

20 

19.20 

.80 

4.0 

920 

910 

915 

26 

19.18 

.82 

4.1 

930 

924 

927 

20 

19.12 

.88 

4.4 

927 

927 

927 

20 

19.12 

.88 

4.4 

932 

922 

927 

23 

19.12 

.88 

4.4 

934 

928 

931 

23 

19.10 

.90 

4.5 

940 

934 

937 

27 

19.06 

.94 

4.7 

940 

938 

939 

24 

19.04 

.96 

4.8 

943 

935 

239 

26 

19.04 

.96 

4.8 





MISSOURI SCHOOU OF MINFS. 


23 


BRAUNITE CUPEL—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

SiK^er 

Loss 

% Loss 

950 

946 

947 

26 

19.00 

1.00 

5.0 

947 

947 

947 

21 

19.00 

1.00 

5.0 

950 

944 

947 

23 

19.00 

1.00 

5.0 

952 

942 

947 

22 

19.00 

1.00 

5.0 

947 

947 

947 

23 

19.00 

1.00 

5.0 

952 

946 

949 

22 

18.98 

1.02 

5.1 

954 

944 

949 

20 

18.98 

1.02 

5.1 

952 

946 

949 

22 

18.98 

1.02 

5.1 

956 

946 

951 

25 

18.96 

1.04 

5.2 

962 

956 

959 

24 

18.92 

1.08 

5.4 

962 

956 

959 

25 

18.92 

1.08 

5.4 

961 

977 

969 

28 

18.86 

1.14 

5.7 

969 

969 

969 

27 

18.86 

1.14 

5.7 

975 

967 

971 

23 

18.84 

1.16 

5.8 

975 

967 

971 

23 

18.84 

1.16 

5.8 

980 

970 

975 

22 

18.82 

1.18 

5.9 

975 

975 

975 

22 

18.82 

1.18 

5:9' 

982 

976 

979 

. 21 

18.80 

1.20 

6.0. 

979 

979 

979 

23 

18.80 

1.20 

6.0. 

980 

978 

979 

27 

18.80 

1.20 

6.0 

982 

976 

979 

24 

18.80 

1.20 

6.0. 

984 

974 

979 

27 

18.80 

1.20 

6.0. 

984 

974 

979 

24 

18.80 

1.20 

6.0. 

979 

979 

979 

22 

18.80 

1.20 

6.0 

986 

980 

983 

25 

18.78 

1.22 

6.1. 

983 

983 

983 

22 

18.78 

1.22 

6.1. 

988 

980 

984 

22 

18.76 

1.24 

6.2. 

986 

982 

984 

28 

18.76 

1.24 

6.2. 

990 

984 

987 

26 

18.74 

1.26 

6.3. 

995 

985 

990 

26 

18.72 

1.28 

6.4. 

996 

986 

990 

23 

18.72 

1.28 

6.4. 

994 

986 

990 

21 

18.72 

1.28 

6.4. 

992 

990 

991 

22 

18.72 

1.28 

6.4 

996 

990 

993 

23 

18.70 

1.30 

6.5 

993 

993 

993 

21 

18.70 

1.30 

6.5 

1000 

996 

997 

23 

18.64 

1.36 

6.8. 

1010 

1004 

1007 

22 

18.60 

1.40 

7.0- 

1010 

1004 

1007 

24 

18.60 

1.'40 

7.9 

1012 

1006 

1009 

28 

18.58 

1.42 

7.1. 

1015 

1015 

1015 

23 

18.54 

1.46 

7.3. 

1017 

1017 

1017 

27 

18.52 

1.48 

7.4. 

1025 

1025 

1025 

24 

18.44 

1.56 

7.8. 

1027 

1027 

1027 

23 

18.42 

1.58 

7.9. 




Table No. 

7 


. 


PATENTED 

BONEASH 

CUPEL 

NO. 1 

. 

680 

670 

675 

26 

19.80 

.20 

1.9 

714 

700 

707 

26 

19.66 

.34 

1.7. 

720 

710 

715 

27 

19.62 

.38 

1.9 

724 

714 

719 

30 

19.60 

.40 

2.9 

722 

716 

719 

26 

19.60 

.40 

2.0 

719 

719 

719 

26 

19.60 

.40 

2.9 

730 

720 

725 

26 

19.56 

.44 

2.2 












24 


MISSOURI SCTIOOR OF MINIMS. 


PATENTED BONEASH CUPEL—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

725 

725 

725 

26 

19.56 

.44 

2.2 

734 

728 

731 

30 

19.54 

.46 

2.3 

734 

728 

731 

30 

19.54 

.46 

2.3 

736 

726 

731 

26 

19.54 

.46 

2.3 

731 

731 

731 

27 

19.54 

.46 

2.3 . 

736 

726 

731 

27 

19.54 

.46 

2.3 

734 

728 

731 

27 

19.54 

.46 

2.3 

740 

730 

735 

25 

19.52 

.48 

■ 2.4 

742 

736 

739 

25 

19.50 

.50 

2.5 

739 

739 

739 

25 

19.50 

.50 

2.5 

750 

744 

747 

26 

19.48 

.52 

2.6 

790 

784 

787 

26 

19.48 

.52 

2.6 

775 

775 

775 

24 

19.48 

.52 

2.6 

790 

784 

787 

27 

19.46 

.54 

2.7 

787 

787 

787 

25 

19.46 

.54 

2.7 

790 

784 

787 

26 

19.46 

.54 

2.7 

787 

787 

787 

26 

19.46 

.54 

2.7 

804 

794 

799 

25 

19.44 

.56 

2.8 

804 

794 

799 

30 

19.44 

.56 

2.8 

799 

799 

799 

26 

19.44 

.56 

2.8 

802 

796 

799 

26 

19.44 

.56 

2.8 

802 

796 

799 

27 

19.44 

.56 

2.8 

814 

808 

811 

26 

19.42 

.58 

2.9 

822 

816 

819 

25 

19.40 

.60 

3.0 

819 

819 

819 

30 

19.40 

.60 

3.0 

819 

818 

819 

26 

19.40 

.60 

3.0 

822 

816 

819 

27 

19.40 

.60 

3.0 

826 

820 

823 

25 

19.38 

.62 

3.1 

827 

819 

823 

26 

19.38 

.62 

3.1 

830 

824 

827 

26 

19.36 

.64 

3.2 

828 

827 

827 

24 

19.36 

.64 

3.2 

840 

830 

835 

25 

19.34 

.66 

3.3 

838 

832 

835 

30 

19.34 

.66 

3.3 

838 

832 

835 

25 

19.34 

.66 

3.3 

835 

835 

835 

27 

19.34 

.66 

3.3 

844 

834 

839 

24 

19.32 

.68 

3.4 

843 

835 

839 

23 

19.32 

.68 

3.4 

839 

839 

839 

26 

19.32 

.68 

3.4 

845 

832 

839 

26 

19.32 

.68 

3.4 

844 

834 

839 

25 

19.32 

.68 

3.4 

839 

839 

839 

27 

19.32 

.68 

3.4 

850 

844 

847 

23 

19.30 

.70 

3.5 

847 

847 

847 

23 

19.30 

.70 

3.5 

847 

847 

847 

23 

19.30 

.70 

3.5 

847 

847 

847 

30 

19.30 

.70 

3.5 

847 

847 

847 

26 

19.30 

.70 

3.5 

858 

844 

852 

26 

19.30 

.70 

3.5 

852 

842 

847 

25 

19.30 

.70 

3.5 

:849 

846 

847 

24 

19.30 

.70 

3.5 

854 

848 

851 

28 

19.28 

.72 

3.6 

854 

848 

851 

28 

19.28 

.72 

3.6 

•852 

851 

851 

26 

19.28 

.72 

3.6 

851 

851 

851 

25 

19.28 

.72 

3.6 

860 

852 

856 

24 

19.26 

.74 

3.7 

860 

852 

856 

28 

19.26 

.74 

3.7 






Top 

856 

862 

859 

862 

870 

870 

869 

867 

870 

868 

867 

872 

870 

872 

872 

880 

880 

883 

879 

880 

880 

882 

885 

890 

894 

900 

899 

906 

910 

907 

907 

907 

907 

910 

918 

925 

930 

934 

940 

938 

940 

942 

946 

948 

950 

950 

955 

955 

960 

966 

965 

970 

972 

982 

986 


MISSOURI SCHOOL OF MINES. 


25 


PATENTED BONEASH CUPEL—Contd. 


Temperature Silver 

Time 


Bottom 

Average 


Weight 

Loss 

% Loss 

856 

856 

27 

19.26 

.74 

3.7 

856 

859 

23 

19.24 

.76 

3.8 

859 

859 

23 

19.24 

.76 

3.8 

856 

859 

24 

19.24 

.76 

3.8 

864 

867 

25 

19.22 

.78 

3.9 

864 

867 

25 

19.22 

.78 

3.9 

865 . 

867 

23 

19.22 

.78 

3.9 

867 

867 

27 

19.22 

.78 

3.9 

864 

867 

25 

19.22 

.78 

3.9 

867 

867 

27 

19.22 

.78 

3.9 

867 

867 

24 

19.22 

.78 

3.9 

866 

869 

25 

19.20 

.80 

4.0 

^69 

869 

24 

19.20 

.80 

4.0 

866 

869 

24 

19.20 

.80 

4.0 

866 

869 

24 

19.20 

.80 

4.0 

870 

875 

26 

19.18 

.82 

4.1 

870 

875 

25 

19.18 

.82 

4.1 

875 

879 

28 

19.16 

.84 

4.2 

879 

879 

28 

19.16 

.84 

4.2 

878 

879 

26 

19.16 

.84 

4.2 

878 

879 

25 

19.16 

.84 

4.2 

876 

879 

27 

19.16 

.84 

4.2 

881 

883 

26 

19.14 

.86 

4.3 

884 

887 

27 

19.12 

.88 

4.4 

888 

891 

27 

19.10 

.90 

4.5 

899 

899 

27 

19.06 

.94 

4.7 

899 

899 

23 

19.06 

.94 

4.7 

900 

903 

22 

19.04 

.96 

4.8 

904 

907 

28 

19.02 

.98 

4.9 

907 

907 

20 

19.02 

.98 

4.9 

907 

907 

30 

19.02 

.98 

4.9 

907 

907 

23 

19.00 

1.00 

5.0 

907 

907 

21 

19.00 

1.00 

5.0 

904 

907 

25 

19.00 

1.00 

5.0 

912 

915 

26 

18.96 

1.04 

5.2 

921 

923 

20 

18.92 

1.08 

5.4 

924 

927 

21 

18.90 

1.10 

5.5 

928 

931 

22 

18.88 

1.12 

5.6 

930 

935 

26 

18.84 

1.16 

5.8 

932 

935 

20 

18.84 

1.16 

5.8 

930 

935 

24 

18.84 

1.16 

5.8 

936 

939 

26 

18.82 

1.18 

5.9 

940 

943 

22 

18.80 

1.20 

6.0 

942 

945 

23 

18.78 

1.22 

6.1 

940 

945 

23 

18.78 

1.22 

6.1 

944 

947 

22 

18.76 

1.24 

6.2 

947 

951 

21 

18.74 

1.26 

6.3 

955 

955 

22 

18.72 

1.28 

6.4 

950 

955 

21 

18.72 

1.28 

6.4 

960 

963 

22 

18.66 

1.34 

6.7 

961 

963 

23 

18.66 

1.34 

6.7 

964 

967 

22 

18.62 

1.38 

6.9 

970 

971 

23 

18.60 

1.40 

7.0 

981 

981 

24 

18.52 

1.48 

7.4 

980 

983 

22 

18.50 

1.50 

7.5 







26 


MISSOURI SCHOOR OF MINES. 


PATENTED BONEAvSH CUPEL—Cont. 


Top 

Temperature 

Bottom 

Average 

Time 

W eight 

Silver 

Loss 

% Loss 

994 

984 

989 

25 

18.46 

1.54 

7.7 

1003 

995 

999 

25 

18.38 

1.62 

8.1 

1001 

1001 

1001 

23 

18.36 

1.64 

8.2 

1010 

1004 

1007 

22 

18.32 

1.68 

8.4 

1009 

1009 

1009 

22 

18.30 

1.70 

8.5 

1011 

1011 

1011 

20 

18.28 

1.72 

8.6 

1011 

1011 

1011 

23 

18.28 

1.72 

8.6 

1013 

1013 

1013 

24 

18.26 

1.74 

8.7 

1013 

1013 

1013 

26 

18.26 

1.74 

8.7 

1015 

1015 

1015 

22 

18.20 

1.80 

9.0 

1017 

1017 

1017 

21 

18.14 

1.86 

9.8 

1021 

1021 

1021 

24 

18.04 

1.96 

9.S 

1022 

1022 

1022 

21 

18.02 

1.98 

9.0 

1023 

1023 

1023 

23 

18.00 

2.00 

10.0 

1023 

1023 

1023 

23 

18.00 

2.00 

10.0 

1027 

1027 

1027 

24 

17.90 

2.10 

10.5 

1019 

1019 

1019 

28 

17.84 

2.16 

10.S 

1029 

1029 

1029 

28 

17.82 

2.18 

10.0 

1031 

1031 

1031 

27 

17.76 

2.24 

11.2 

1035 

1035 

1035 

22 

17.72 

2.28 

11.4 

1035 

1035 

1035 

24 

17.60 

2.40 

12.0 


Table No. 8 

PATENTED BONEASH CUPEL NO. 2 

686 

680 

683 

21 

19.74 

.26 

1.3 

688 

678 

683 

20 

19.74 

.26 

1.3. 

710 

700 

705 

21 

19.72 

.28 

1.4 

710 

708 

709 

21 

19.70 

.30 

1.5 

715 

703 

709 

20 

19.70 

.30 

1.5 

714 

704 

709 

20 

19.70 

.30 

1.5 

720 

702 

711 

20 

19.68 

.32 

1.0 

720 

710 

715 

22 

19.66 

.34 

1.7 

715 

715 

715 

20 

19.66 

.34 

1.7 

720 

710 

715 

20 

19.66 

.34 

1.7 

720 

714 

717 

21 

19.64 

.36 

1.8. 

719 

715 

717 

22 

19.64 

.36 

1.8 

719 

719 

719 

21 

19.62 

.38 

1.0 

724 

714 

719 

22 

19.62 

.38 

1.9 

722 

716 

719 

21 

19.62 

.38 

1.9 

722 

716 

719 

20 

19.62 

.38 

1.9 

726 

720 

723 

21 

19.60 

.40 

2.0 

728 

718 

723 

22 

19.60 

.40 

2.9 

730 

724 

727 

21 

19.58 

.42 

2.1 

727 

727 

727 

18 

19.58 

.42 

2.1 

734 

720 

727 

22 

19.58 

.42 

2.1 

730 

724 

727 

21 

19.58 

.42 

2.1 

734 

720 

727 

20 

19.58 

.42 

2.1 

734 

724 

729 

18 

19.56 

.44 

2.2 

729 

729 

729 

20 

19.56 

.44 

2.2 

736 

728 

732 

24 

19.54 

.46 

2.3 

734 

730 

732 

21 

19.54 

.46 

2.3 

732 

732 

732 

18 

19.54 

.46 

2.3 










MISSOURI SCHOOU OF MINE:S. 


27 


PATENTED BONEASH CUPEL NO. 2—Contd. 


Temperature 

Top Bottom Average 

Time 

Weight 

Silver 

Loss 

% Loss 

736 

728 

732 

22 

19.54 

.46 

2.3 

740 

730 

735 

21 

19.52 

.48 

2.4 

742 

728 

735 

20 

19.52 

.48 

2.4 

738 

732 

735 

22 

19.52 

.48 

2.4 

738 

740 

739 

21 

19.50 

.50 

2.5 

739 

739 

739 

20 

19.50 

.50 

2.5 

746 

736 

741 

20 

19.48 

.52 

2.6 

744 

738 

741 

22 

19.48 

.52 

2.6 

741 

741 

741 

22 

19.48 

.52 

2.6 

746 

736 

741 

20 

19.48 

.52 

2.6 

746 

744 

745 

22 

19.46 

.54 

2.7 

750 

744 

747 

28 

19.44 

.56 

2.8 

747 

747 

747 

24 

19.44 

.56 

2.8 

752 

742 

747 

18 

19.44 

.56 

2.8 

750 

744 

747 

20 

19.44 

.56 

2.8 

747 

747 

747 

20 

19.44 

.56 

2.8 

750 

744 

747 

22 

19.44 

.56 

2.8 

747 

747 

747 

20 

19.44 

.56 

2.8 

750 

744 

747 

21 

19.44 

.56 

2.8 

750 

748 

749 

18 

19.42 

.58 

2.9 

749 

749 

749 

22 

19.42 

.58 

2.9 

752 

746 

749 

22 

19.42 

.58 

2.9 

752 

746 

749 

20 

19.42 

.58 

2.9 

756 

742 

749 

21 

19.42 

.58 

2.9 

756 

750 

753 

22 

19.40 

.60 

3.0 

758 

748 

753 

20 

19.40 

.60 

3.0 

752 

752 

752 

20 

19.40 

.60 

3.0 

752 

752 

752 

22 

19.40 

.60 

3.0 

756 

750 

753 

20 

19.40 

.60 

3.0 

758 

748 

753 

20 

19.40 

.60 

3.0 

758 

752 

755 

21 

19.38 

.62 

3.1 

761 

757 

759 

18 

19.36 

.64 

3.2 

759 

759 

759 

18 

19.36 

.64 

3.2 

761 

757 

759 

20 

19.36 

.64 

3.2 

764 

758 

761 

21 

19.34 

.66 

3.3 

764 

762 

763 

21 

19.32 

.68 

3.4 

766 

760 

763 

21 

19.32 

.68 

3.4 

768 

758 

763 

20 

19.32 

.68 

3.4 

768 

758 

763 

20 

19.32 

.68 

3.4 

763 

763 

763 

20 

19.32 

.68 

3.4 

768 

758 

763 

20 

19.32 

.68 

3.4 

768 

762 

765 

21 

19.30 

.70 

3.5 

770 

760 

765 

21 

19.30 

.70 

3.5 

770 

769 

769 

20 

19.28 

.72 

3.6 

778 

768 

773 

21 

19.26 

.74 

3.7 

780 

779 

779 

28 

19.22 

.78 

3.9 

784 

774 

779 

20 

19.22 

.78 

3.9 

781 

777 

779 

21 

19.20 

.80 

4.0 

779 

779 

779 

20 

19.20 

.80 

4.0 

780 

770 

775 

28 

19.16 

.84 

4.2 

794 

780 

785 

18 

19.16 

.84 

4.2 

797 

780 

787 

23 

19.14 

.86 

4.3 

794 

788 

791 

20 

19.12 

.88 

4.4 

791 

791 

791 

23 

19.12 

.88 

• 4.4 







28 


MISSOURI SCHOOL OF MINLS. 


PATENTED BONEASH CUPEL NO. 2—Contd. 


Temperature Silver 

Time 


Top 

Bottom 

Average 


Weight 

Loss 

% Loss 

796 

795 

795 

28 

19.08 

.92 

4.6 

800 

790 

795 

21 

19.08 

.92 

4.6 

807 

791 

799 

30 

19.06 

.94 

4.7 

802 

796 

799 

20 

19.06 

.94 

4.7 

802 

801 

801 

21 

19.04 

.96 

4.8 

804 

798 

801 

27 

19.04 

.96 

4.8 

810 

804 

807 

22 

19.00 

1.00 

5.0 

810 

804 

807 

20 

19.00 

1.00 

5.0 

807 

807 

807 

25 

19.00 

1.00 

5.0 

822 

816 

819 

22 

18.90 

1.10 

5.5 

830 

824 

827 

21 

18.82 

1.18 

5.9 

830 

829 

829 

21 

18.80 

1.20 

6.0 

835 

827 

831 

22 

18.78 

1.22 

6.1 

831 

831 

831 

26 

18.78 

1.22 

6.1 

846 

832 

839 

24 

18.70 

1.30 

6.5 

850 

840 

845 

23 

18.64 

1.36 

6.8 

845 

845 

845 

26 

18.64 

1.36 

6.8 

847 

843 

845 

22 

18.64 

1.36 

6.8 

847 

843 

845 

28 

18.64 

1.36 

6.8 

850 

849 

849 

24 

18.62 

1.38 

6.9 

856 

850 

853 

23 

18.56 

1.44 

7.2 

853 

853 

853 

23 

18.56 

1.44 

7.2 

857 

853 

855 

22 

18.54 

1.46 

7.3 

860 

854 

857 

20 

18.52 

1.48 

7.4 

866 

860 

863 

24 

18.46 

1.54 

7.7 

870 

860 

8,65 

24 

18.40 

1.60 

8.0 

870 

864 

867 

20 

18.38 

1.62 

8.1 

867 

867 

867 

20 

18.38 

1.62 

8.1 

874 

868 

871 

23 

18.34 

1.66 

8.3 

874 

870 

872 

26 

18.32 

1.68 

8.4 

874 

873 

873 

22 

18.30 

1.70 

8.5 

880 

874 

877 

28 

18.24 

1.76 

8.8 

881 

877 

879 

22 

18.22 

1.78 

8.9 

882 

881 

881 

22 

18.20 

1.80 

9.0 

886 

880 

883 

23 

18.16 

1.84 

9.2 

890 

880 

885 

22 

18.12 

1.88 

9.4 

885 

885 

885 

24 

18.12 

1.88 

9.4 

890 

884 

887 

26 

18.10 

1.90 

9.5 

892 

886 

889 

23 

18.08 

1.92 

9.6 

900 

890 

895 

18 

18.00 

2.00 

10.0 

915 

895 

905 

22 

17.78 

2.22 

11.1 

912 

898 

905 

21 

17.78 

2.22 

11.1 • 

912 

902 

907 

24 

17.74 

2.26 

11.3 

920 

902 

911 

23 

17.62 

2.38 

11.9 

920 

914 

917 

27 

17.54 

2.46 

12.3 

920 

920 

920 

27 

17.46 

2.54 

12.7 

926 

918 

922 

22 

17.44 

2.56 

12.8 

930 

920 

925 

23 

17.38 

2.62 

13.1 

930 

924 

927 

24 

17.34 

2.66 

13.3 

930 

929 

929 

22 

17.26 

2.74 

13.7 

936 

926 

931 

22 

17.22 

2.78 

13.9 

936 

928 

932 

26 

17.20 

2.80 

14.0 

940 

930 

935 

28 

17.12 

2.88 

14.4 

940 

934 

937 

21 

17.10 

2.90 

14.5 

950 

• 936 

943 

23 

16.80 

3.20 

16.0 





MISSOURI SCHOOU OF MINE:S. 


29 


PATENTED BONEASH CUPEL NO. 2—Cont. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

950 

938 

943 

23 

16.80 

3.20 

16.0 

950 

954 

957 

24 

16.64 

3.36 

16.8 

962 

948 

955 

25 

16.32 

3.68 

18.4 




Table No. 

9 





PATENTED CUPEL NO 3. 


• 

706 

700 

703 

20 

19.80 

.20 

1.0 

705 

701 

703 

20 

19.80 

.20 

1.0 

706 

700 

703 

17 

19.80 

.20 

1.0 

709 

709 

709 

20 

19.74 

.26 

1.3 

712 

706 

709 

20 

19.74 

. 26 

1.3 

720 

710 

715 

21 

19.68 

.32 

1.6 

716 

714 

715 

21 

19.68 

.32 

1.6 

718 

712 

715 

21 

19.68 

.32 

1.6 

720 

710 

715 

22 

19.68 

.32 

1.6 

717 

713 

715 

24 

19.68 

.32 

1.6 

719 

711 

715 - 

21 

19.68 

.32 

1.6 

720 

718 

719 

21 

19.66 

.34 

1.7 

721 

717 

719 

24 

19.66 

.34 

1.7 

724 

714 

719 

22 

19.66 

.34 

1.7 

726 

720 

723 

22 

19.64 

.36 

1.8 

728 

718 

723 

24 

19.64 

.36 

1.8 

724 

722 

723 

24 

19.64 

.36 

1.8 

724 

722 

723 

20 

19.64 

.36 

1.8 

740 

734 

737 

21 

19.62 

.38 

1.9 

740 

734 

737 

21 

19.62 . 

.38 

1.9 

738 

736 

737 

22 

19.62 

.38 

1.9 

737 

737 

737 

22 

19.62 

.38 

1.9 

738 

736 

737 

20 

19.62 

.38 

1.9 

750 

740 

745 

20 

19.60 

.40 

2.0 

750 

740 

745 

21 

19.60 

.40 

2.0 

746 

744 

745 

21 

19.60 

.40 

2.0 

745 

745 

745 

21 

19.60 

.40 

2.0 

748 

742 

745 

22 

19.60 

.40 

2.0 

746 

744 

745 

22 

19.60 

.40 

2.0 

750 

740 

745 

24 

19.60 

.40 

2.0 

745 

745 

745 

24 

19.60 

.40 

2.0 

748 

742 

745 

22 

19.60 

.40 

2.0 

749 

741 

745 

19 

19.60 

.40 

2.0 

750 

740 

745 

20 

19.60 

.40 

2.0 

750 

740 

745 

24 

19.60 

.40 

2.0 

752 

750 

751 

20 

19.58 

.42 

2.1 

751 

751 

751 

21 

19.58 

.42 

2.1 

754 

748 

751 

22 

19.58 

.42 

2.1 

756 

746 

751 

22 

19.58 

.42 

2.1 

756 

746 

751 

22 

19.58 

.42 

2.1 

752 

750 

751 

24 

19.58 

.42 

2.1 

754 

748 

751 

21 

19.58 

.42 

2.1 

754 

756 

755 

22 

19.56 

.44 

2.2 

755 

755 

755 

24 

19.56 

.44 

2.2 

755 

755 

755 

22 

19.56 

.44 

2.2 

760 

750 

755 

24 

19.56 

.44 

2.2 

760 

750 

755 

22 

19.56 

.44 

2.2 









30 


MISSOURI SCHOOL OF MINES. 




PATENTED 

CUPEL 

NO. 3— 

-Contd. 


Temperature 

Top Bottom Average 

Time 

Weight 

Silver 

Loss 

% Loss 

758 

752 

755 

24 

19.56 

.44 

2.2 

758 

752 

755 

17 

19.56 

.44 

2.2 

760 

758 

759 

20 

19.54 

.46 

2.3 

763 

755 

759 

21 

19.54 

.46 

2.3 

763 

755 

759 

21 

19.54 

.46 

2.3 

766 

742 

759 

21 

19.54 

.46 

2.3 

762 

756 

759 

22 

19.54 

.46 

2.3 

762 

756 

759 

24 

19.54 

.46 

2.3 

762 

756 

759 

19 

19.54 

.46 

2.3 

764 

754 

759 

24 

19.54 

.46 

2.3 

759 

759 

759 

20 

19.54 

.46 

2.3 

759 

759 

759 

20 

19.54 

.46 

2.3 

760 

758 

759 

17 

19.54 

.46 

2.3 

763 

755 

759 

17 

19.54 

.46 

2.3 

764 

754 

759 

21 

19.54 

.46 

2.3 

764 

758 

761 

20 

19.52 

.48 

2.4 

766 

756 

761 

21 

19.52 

.48 

2.4 

761 

761 

761 

22 

19.52 

.48 

2.4 

764 

758 

761 

22 

19.52 

.48 

2.4 

762 

760 

761 

19 

19.52 

.48 

2.4 

766 

760 

763 

21 

19.50 

.50 

2.5 

763 

763 

763 

22 

19.50 

.50 

2.5 

768 

758 

763 

22 

19.50 

.50 

2.5 

770 

756 

763 

22 

19.50 

.50 

2.5 

766 

760 

763 

22 

19.50 

.50 

2.5 

764 

762 

763 

19 

19.50 

.50 

2.5 

766 

760 

763 

20 

19.50 

.50 

2.5 

768 

758 

763 

20 

19.50 

.50 

2.5 

770 

756 

763 

24 

19.50 

.50 

2.5 

763 

763 

763 

20 

19.50 

.50 

2.5 

768 

758 

763 

17 

19.50 

.50 

2.5 

770 

760 

765 

22 

19.48 

.52 

2.6 

765 

765 

765 

24 

19.48 

.52 

2.6 

770 

764 

767 

20 

19.46 

.54 

2.7 

767 

767 

767 

20 

19.46 

.54 

2.7 

770 

768 

769 

19 

19.44 

.56 

2.8 

772 

765 

769 

20 

19.44 

.56 

2.8 

774 

764 

769 

20 

19.44 

.56 

2.8 

774 

764 

769 

17 

19.44 

.56 

2.8 

776 

770 

773 

20 

19.42 

.58 

2.9 

778 

770 

773 

17 

19.42 

.58 

2.9 

776 

770 

773 

21 

19.42 

.58 

2.9 

780 

770 

775 

21 

19.40 

.60 

3.0 

/ / / 

773 

775 

21 

19.40 

.60 

3.0 

778 

772 

775 

24 

19.40 

.60 

3.0 

778 

772 

775 

24 

19.40 

.60 

3.0 

780 

770 

775 

22 

19.40 

.60 

3.0 

775 

775 

775 

21 

19.40 

.60 

3.0 

780 

774 

777 

19 

19.38 

.62 

3.1 

782 

776 

779 

20 

19.36 

.64 

3.2 

790 

784 

787 

20 

19.32 

.68 

3.4 

800 

790 

795 

21 

19.30 

.70 

3.5 

800 

790 

795 

17 

19.30 

.70 

3.5 

797 

793 

795 

20 

19.30 

.70 

3.5 

800 

798 

799 

19 

19.28 

.72 

3.6 






MISSOURI SCIiOOU OF MINKS. 


31 


PATENTED^CUPEL NO. 3—Contd. 


Top 

Temperature 

Bottom 

Average 

Time 

Weight 

Silver 

Loss 

% Loss 

799 

799 

799 

20 

19.28 

.72 

3.6 

805 

801 

803 

20 

19.26 

.74 

3.7 

807 

799 

803 

20 

19.26 

.74 

3.7 

820 

802 

811 

24 

19.22 

.78 

3.9 

830 

800 

815 

24 

19.20 

.80 

4.0 

823 

815 

819 

20 

19.18 

.82 

4.1 

830 

824 

827 

24 

19.14 

.86 

4.3 

828 

827 

827 

24 

19.14 

.86 

4.3 

832 

826 

829 

24 

19.12 

.88 

4.4 

840 

830 

835 

19 

19.10 

.90 

4.5 

842 

836 

839 

24 

19.08 

.92 

4.6 

846 

840 

843 

25 

19.04 

.96 

4.8 

855 

847 

851 

24 

19.00 

1.00 

5.0 

860 

842 

851 

25 

19.00 

1.00 

5.0 

860 

854 

857 

24 

18.96 

1.04 

5.2 

870 

864 

867 

25 

18.90 

1.10 

5.5 

874 

868 

871 

25 

18.56 

1.14 

5.7 

880 

870 

87 5 

25 

18.84 

1.16 

. 5.8 

886 

880 

883 

25 

18.78 

1.22 

6.1 

883 

883 

883 

25 

18.78 

1.22 

6.1 

890 

880 

885 

24 

18.76 

1.24 

6.2 

896 

886 

891 

25 

18.66 

1.34 

6.7 

908 

898 

903 

22 

18.60 

1.40 

7.0 

905 

905 

905 

22 

18.58 

1.42 

7.1 

920 

912 

916 

28 

18.48 

1.52 

7.6 

922 

916 

919 

28 

18.46 

1.54 

1 . 1 

926 

920 

923 

28 

18.42 

1.58 

7.9 

929 

925 

927 

23 

18.38 

1.62 

8.1 

927 

927 

927 

DO 

18.38 

1.62 

8.1 

928 

928 

933 

22 

18.32 

1.68 

8.4 

940 

934 

937 

28 

18.28 

1.72 

8.6 

941 

941 

941 

28 

18.24 

1.76 

8.8 

946 

940 

943 

28 

18.22 

1.78 

8.9 

950 

944 

947 

28 

18.18 

1.82 

9.1 

956 

950 

953 

22 

18.12 

1.88 

9.4 

953 

953 

953 

23 

18.12 

1.88 

9.4 

960 

954 

957 

28 

18.08 

1.92 

9.6 

957 

957 

957 

22 

18.08 

1 .92 

9.6 

956 

956 

961 

22 

18.04 

1.96 

9.8 

963 

963 

963 

22 

18.02 

1.98 

9.9 

966 

960 

963 

22 

18.02 

1.98 

9.9 

968 

958 

963 

23 

17.96 

2.04 

10.2 

980 

970 

975 

23 

17.88 

2.12 

10.6 

980 

978 

979 

23 

17.62 

2.38 

11.9 

1008 

998 

1003 

23 

17.60 

2.40 

12.0 

1030 

1010 

1020 

23 

17.58 

2.42 

12.1 

1028 

1018 

1023 

23 

17.40 

2.60 

13.0 







Percentage Silver L asses. 


32 


MISSOURI SCHOOU 01^ MINKS. 


Temperature - Degrees C. 



tOSOr —^—r T - I—r I " T - r ' -T ’-i—i—r-n—i—r-i—i—i—m—m—i—i—^— \ —^—i—i I f"! r-T"''r-'-r—i i i r—i \ i i i i 








































































































































































































































































MISSOURI SCHOOU OR MINRS. 


33 


Discussion of Results. 

The laboratory boneash cupels were made by mixing* about 
8-9% of water with the boneash and molding in a foot-operated ma¬ 
chine. These cupels were then air-dried for three months before 
using*. The results are given in table No. 1 and are plotted as a 
"‘Boneash” Curve No. 1. 

The half cement and half boneash cupels. Table No. 2, Curve 
No. 1. This cupel was made by mixing one-half boneash and one- 
half Portland cement with between 8 and 9 per cent water, and then 
molded in a foot-power machine. The cupels were air-dried for 
three months before using. These cupels feathered as readily as did 
the boneash cupels. A great deal of trouble was experienced with 
these cupels due to spitting, regardless of the manner in which the 
work was carried out. The beads did not break clean from these 
cupels, so that they required a great deal of brushing before weigh¬ 
ing. 

The cement base with boneash top cupel, Table No. 3, Curve 
No. 1, was made by placing about one-fourth inch of boneash in the 
bottom of the cupel mould, and filling the balance with Portland 
cement. This cupel was then dried for three months before using. 
So far as silver losses go, this cupel is very satisfactory. It is ob¬ 
jectionable, however, due to the fact that the bond between the 
cement base and boneash top is very weak, so that it requires the 
most careful handling to prevent the boneash bowl breaking from 
the base of the cupel. 

The cement cupels, Table No. 4, Curve No. 1, were made by 
mixing Portland cement with between 8 and 9 per cent of watey 
moulding in a foot-power machine, and then air-drying in a steam- 
heated room for three months. This cupel feathered as well as any 
cupel used. The loss of silver was very high, even under the most 
favorable conditions. With these cupels the beads were held very 
firmly, so that it was necessary at times to pry them loose from the 
cupels, and the only satisfactory manner of cleaning the beads was 
to scrape the bottom and to brush them. This operation not only 
entails a danger of loss, but is very tedious. 

The Morganite cupel. Table No. 5, Curve No. 1, gave the best 
results as far as silver losses were concerned. The bead separated 
from the cupel very readily and was so clean that brushing was 
practically unnecessary. We found that cupellation had to be car¬ 
ried on at a much higher temperature than with other types of 
cupels, it being practically impossible to finish a cupellation with a 
furnace temperature of less than 770°C. This makes it almost im¬ 
possible to feather this type of cupel. With cupels of this type, 
when the furnace temperature is less than about 850°C, the silver 
beads retain lead. 

Next to the Morganite, the Braunite patented cupel. Table 
No. 6, Curve No. 1, gave the most satisfactory results. It feathered 


34 


MISSOURI SCHOOU OF MINKS. 


very readily at the lower temperatures. For some reason this cupel 
gave a great deal of trouble by spitting. The beads were easily 
removed from this cupel and required but little brushing before 
weighing. When the furnace temperature was less than about 
800°C the beads retained lead. 

Patented boneash cupel No. 1, Table No. 7, Curve No. 1. This 
is a boneash cupel'made by one of the assay supply houses. The 
bowl of the cupel was very deep, which materially increased the 
time of cupellation. At temperatures below 800°C this cupel gave 
a high loss. Above that temperature the loss was less than with 
the laboratory boneash cupels. 

Patented boneash cupel No. 2, Table No. 8, Curve No. 1. This 
is a boneash cupel made by another assay supply house and looks 
very good. The results at temperatures under 800°C were erratic. 

The losses occurring with the laboratory boneash cupel, Mor- 
ganite cupel, patented cupel No. 1, and patented cupel No. 3, were 
checked by Mr. M. H. Thornberry, using 200 milligrams of silver 
and 20 grams of lead. His data is given in Curve No. 2. This 
checks very closely the results of Taggart and Karte. 


MISSOURI SCHOOL OF MINKS. 


35 



^ 090 / 























































































































































36 


MISSOURI SCHOOL OF MINKS. 


The Effect of the Amount of Moisture and the Hardness of the 

Cupels on the Silver Loss. 

In carrying out this work five sets of cupels were made with 
varying degrees of moisture. 

First: Cupels marked “Very Dry,” which contained 5 per 
cent, of water mixed with the boneash. 

Second: A set marked “Dry” with about 8 per cent, moisture. 

Third : A set marked “Ordinary” with about 12 per cent, mois¬ 
ture. 

Fourth : A set marked “Wet” with about 17 per cent, mois¬ 
ture. 

Fifth : A set marked “Very Wet” with about 22 per cent mois¬ 
ture. 

From each one of the above, cupels varying in hardness were 
made, being marked as follows: 

First: “Very Soft.” This cupel was made just as soft as it 
was possible to remove it from the cupel machine. Most of these 
cupels broke in handling and were of no use from a practical stand¬ 
point, as better than 90 per cent of them were ruined before they 
could be dried and placed in the furnace for use. 

Second: A set marked “Soft.” These cupels were harder than 
the “Very Soft” cupels, but still were too soft to stand any amount 
of handling. 

Third : A set marked “Ordinary.”- These cupels were such as 
are ordinarily used around the laboratories, hard enough to stand 
handling very well. 

Fourth: A set marked “Hard.” These cupels were made 
much harder than the ordinary cupels, the attempt being to grade 
them between the ordinary cupel and the very hard cupel. 

Fifth: A very hard cupel. These cupels were made just as 
hard as it was possible to make them in a hand mould, each cupel 
being given 20 to 25 sharp blows of the hammer. 

The results are given in table No. 14. This work shows that 
the amount of moisture and the hardness of the cupels have very 
little effect on the loss of silver in cupellation. The only noticeable 
difference in the action of the various cupels is that the very soft 
cupels finished slightly quicker than the hard cupels. This work 
was checked once, using 100 milligrams of silver (table No. 14B), 
and was checked hurriedly (table No. 14C). In table No. 14C, the 
results for the wet, ordinary, soft, and very soft, with 12 per cent, 
moisture, all of the dry set, and of the very hard, with 5 per cent, 
moisture, show much higher loss than does the balance of the work. 
These cupellations were run at a higher temperature than the bal¬ 
ance, feathers forming only on one side of the cupels. 


MISSOURI SCHOOL OF MINLS. 


37 


Av. 

Av. 

Very Dry 

Av. 

Dry 

> 

< 

Ordinary 

Av. 

Wet 

> 

<1 

Very Wet j 

oi 

c;^ 

cn cn cn cn cn cn 

01 

cn cn cn cn cn cn 

cn 

cn cn cn cn cn cn 

1 

cn 

cn cn cn cn cn cn 

cn 

cn cn cn cn cn cn 

o 

o 

o o o o o o 

0 

000000 

0 

000000 

0 

000000 

0 

000000 


Cn 

cn CO CO 00 00 

4^ 

00 0 C5 00 05 *-* 1 

4^ 

to -q p5». 05 0 CO 

4^ 

p—* cn pi* cn pi* 05 

Pi* 

cn pi* cn pi* to pi* 


V\ 

to 4i^ 4^ 05 O 4^ 

1 

h-* 

0 00 rf*- 00 0 0 

h-» 

03 0 00 00 0 03 

•-3 

00 0 00 00 0 05 

cn 

05 00 00 pi* pi* to 



0^ o>- 0^ 0^ 0^ 

4^ 

4^ ^ 

4^ 

pt^ p5.. pU p5^ p5p. p;^ 

4^ 

4^ 4^ 4^ 4^ 

4 ^ 

4kp 4k. 4^ 4^ 4»* 4^ 



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CD CD CD CD 00 CD 

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cn 

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pr* 1-* CO 05 ^ 05 


to 05 p-p C5 00 cn 

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p-p to cn pi* pi* cn 



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CO 

0 to 05 05 05 

03 

to pi* p^ 0 00 00 

03 

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38 


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MISSOURI SCHOOL OF MINKS 


39 


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TABLE 14C 

LOSSES IN CUPELLATION 



















































































40 


MISSOURI SCHOOL OF MINES. 


The Effect of the Surface Condition of the Cupel. 

It had been observed from a large number of cupellations made 
by students in the assay laboratory that the condition of the sur¬ 
face of the cupel apparently made no difference in the losses so 
long as the lead remained in one body. 

The following experiments were undertaken to determine the 
correctness of the above-mentioned observations. 

Four sets of cupels were made as follows: 

Set No. 1 : The cupels were made in the ordinary manner, 
after which the die was given about six complete turns in order to 
give as smooth a surface to the cupel as possible. 

In Set No. 2, the cupels were made in the same manner as No. 
1, and then after removal from the machine were scratched until 
all of the smooth surface had been removed. 

In Set No. 3, the die was given about three complete turns, and 
in Set No. 4 was given about two turns. 


Table No. 15 


WELL-GLAZED CUPELS 


Five or Six Turns of 
Cupel Mold 

Lead—20 grams. 
Temperature—Feathering 

Milligrams Silver 

Milligrams Silver 

Silver Loss 

Taken 

Found 


50.80 

49.41 

0.89 

50.54 

49.44 

1.10 

50.42 

49.30 

1.12 

50.30 

49.28 

1.02 

50.76 

49.46 

1.30 

50.24 

49.40 

0.84 

50.38 

49.34 

1.04 

50.50 

49.33 

1.17 

50.60 

49.38 

1.22 

50.30 

49.08 

1.22 

50.42 

49.22 

1.20 

50.84 

49.88 

0.96 

50.30 

49.42 

0.88 

50.48 

49.32 

1.16 

50.14 

48.88 

1.26 


Average 50.46 


49.38 


1.092 

% Loss, 2.16 







MISSOURI SCHOOL OF MINES. 


41 


Table No. 16 


WELL-GLAZED CUPELS 


About Three Turns of Mold. 
Lead—20 grams. 
Temperature—Feathering. 


Milligrams Silver 

Milligrams Silver 


Taken 

Found 

Silver Loss 

50.18 

49.36 

0.82 

50.20 

49.14 

1.06 

50.58 

49.43 

1.15 

50.58 

49.38 

1.20 

50.94 

49.88 

1.06 

50.56 

49.36 

1.20 

50.58 

49.58 

1.00 

50.60 

49.60 

1.00 

50.50 

49.22 

1.28 

50.90 

49.74 

1.16 

50.56 

49.42 

1.14 

50.82 

49.68 

1.14 

Average 50.58 

49.48 

1.108 



% Loss, 2.17 


Table No. 17 


GLAZED CUPELS 


About Two Turns of Mold 
Lead—20 grams. 
Temperature—Feathering. 


Milligrams Silver 
Taken 

Milligrams Silver 
Found 

Silver Loss 

50.56 

49.62 

1.04 

50.00 

48.76 

1.24 

50.24 

48.92 

1.32 

50.60 

49.98 

0.62 

50.74 

49.34 

1.40 

50.70 

49.38 

1.32 

50.74 

49.84 

0.90 

50.20 

49.18 

1.02 

50.40 

49.16 

1.24 

50.26 

48.88 

1.38 

50.30 

48.80 

1.50 

50.68 

49.50 

1.18 

Average 50.46 

49.28 

1.18 

% Loss, 2.33 




















42 


MISSOURI SCHOOL OF MINLS. 


Table No. 18 


WELL-GLAZED CUPELS 



Cupels Scratched 



Lead—20 grams. 
Temperature—Feathering. 

Milligrams Silver 

Milligrams Silver 


Taken 

Found 

Silver Loss 

50.10 

48.77 

1.33 

50.58 

49.56 

1.02 

50.04 

49.24 

0.80 

50.40 

49.40 

1.00 

50.38 

49.36 

1.02 

50.40 

49.26 

1.14 

50.48 

49.38 

1.10 


Average 50.34 49.28 1.058 

% Loss, 2.1 

Conclusion: These results show that the surface condition of the cupel 
has little or no effect on the silver losses. 


Effect of the Size of Boneash on Losses in Cupellation. 

A number of cupels were made from sized boneash and were used 
for cupelling buttons made up as follows : In one case, 20 grams of 
lead and 20 milligrams of silver, and in another case, 20 grams of lead 
and 50 milligrams of silver. The cupellations were made at a feather¬ 
ing temperature. The results are given in tables Nos. 19 and 20, and 
for convenience the average of the two tables are given in table No. 21. 











jMISSOURI school of mines. 


43 


TABLE No. 19 

LOSSEvS IN CUPELLATION 
Mesh Varying 


Per 


No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 

No. 

Gm. 

Mgs. 

Ag. 

Ag. 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 


Pb. 

Ag. 

Found 

Loss 

1 

20 

50.38 

48 

.00 

2 

.38 

4 

.72 

40 

43 

20 

50 

.00 

48 

.88 

1 

.12 

2 

20 








40 

44 

20 

20 

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19 

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0 

.56 

3 

20 

50.76 

49 

00 

CO 

1 

.38 

2 

.72 

40 

45 

20 

50 

.28 

49 

.38 

0 

.90 

4 

20 

20.00 

19 

.24 

0 

.76 

3 

.80 

40 

46 

20 

20 

.00 





5 

20 

50.06 

47 

.80 

2 

.26 

4 

.51 

40 

47 

20 

50 

.48 

49 

.48 

1 

.00 

6 

20 

20.00 

18 

.70 

1 

.30 

6 

.50 

40 

48 

20 

20 

.00 

19 

.52 

0 

.48 

7 

20 

50.62 

49 

.26 

1 

.36 

2 

.69 

40 

49 

20 

50 

.40 

49 

.34 

1 

.06 

8 

20 

20.00 

19 

.10 

0 

.90 

4 

.50 

40 

50 

20 

20 

.00 

19 

.30 

0 

.70 

9 

20 

50.40 

48 

.36 

2 

.04 

4 

.05 

40 

51 

20 

50 

.14 

48 

.86 

1 

.28 

10 

20 

20.00 

18 

.90 

1 

.10 

5 

.50 

40 

52 

20 

20 

.00 

19 

.28 

0 

.72 

11 

20 

50.38 

48 

.00 

2 

.38 

4 

.72 

40 

53 

20 

50 

.10 

48 

.86 

1 

.24 

12 

20 

20.00 

19 

.14 

0 

.86 

4 

.30 

40 

54 

20 

20 

.00 

19 

.52 

0 

.48 

13 

20 

50.10 

48 

.14 

1 

.96 

3 

.91 

40 

55 

20 

50 

.68 

49 

.44 

1 

.24 

14 

20 

20.00 

18 

.96 

1 

.04 

5 

.80 

40 

56 

20 

20 

.00 

19 

.24 

0 

.76 

15 

20 

50.48 

48 

.88 

1 

.60 

3 

.17 

40 

57 

20 

50 

.36 

49 

.00 

1 

.36 

16 

20 

20.00 

18 

.96 

1 

.04 

5 

.80 

40 

58 

20 

20 

.00 

19 

.30 

0 

.70 

17 

20 

50.14 

49 

.00 

1 

.14 

2 

.27 

40 

59 

20 

50 

.70 

49 

.14 

1 

.56 

18 

20 

20.00 

18 

.50 

1 

.50 

7 

.50 

40 

60 

20 

20 

.00 

19 

.12 

0 

.88 

19 

20 

50.06 

48 

.26 

1 

.80 

3 

.59 

40 

61 

20 

50 

.20 

48 

.76 

1 

.44 

20 

20 

20.00 

18 

.34 

1 

.66 

8 

.30 

40 

62 

20 

20 

.00 

19 

.30 

0 

.70 

21 

20 

50.30 

48 

.36 

1 

.94 

3 

.85 

40 

63 

20 

50 

.86 

49 

.40 

1 

.46 

22 

20 

20.00 

18 

.42 

1 

.58 

7 

.90 

40 

64 

20 

20, 

.00 

19 

.14 

0 

.86 

23 

20 

50.22 

48 

.28 

1 

.94 

3 

,86 

40 

65 

20 

50 

.68 

49 

.48 

1 

.20 

24 

20 

20.00 

18 

.54 

1 

.46 

7 

.30 

40 

66 

20 

20 

.00 

19 

.36 

0, 

,64 

25 

20 

50.08 

47. 

,86 

2 

.12 

4 

23 

40 

67 

20 

50 

.48 

49 

.16 

1 

.32 

26 

20 

20.00 

18 

.14 

1 

00 

9 

.30 

40 

68 

20 

20 

.00 

19 

.10 

0. 

,90 

27 

20 

50.34 

49 

.08 

1 

.26 

2 

.50 

40 

69 

20 

50 

.14 

48 

.52 

1 

62 

28 

20 

20.00 

18 

.82 

1 

.18 

5 

.90 

40 

70 

20 

20 

.00 

18 

.98 

1. 

02 

29 

20 

50.60 

48, 

.58 

2 

.02 

3 

.99 

40 

71 

20 

20 

.64 

49 

.10 

1 

,54 

30 

20 

20.00 

19. 

06 

0 

.94 

4 

.70 

40 

72 

20 

20 

.00 

19, 

,18 

0. 

00 

31 

20 

50.20 

48. 

56 

1. 

64 

3 

.26 

40 

73 

20 

50, 

.70 

49, 

.34 

1. 

36 

32 

20 

20.00 

19. 

00 

1. 

00 

5. 

00 

40 

74 

20 

20. 

00 

18. 

26 

0. 

74 

33 

20 

50.40 

49. 

00 

1. 

40 

2. 

78 

40 

75 

20 

50. 

26 

48. 

66 

1. 

60 

34 

20 

20.00 

19. 

08 

0. 

92 

4. 

60 

40 

76 

20 

20. 

00 

19. 

36 

0. 

64 

35 

20 

50.62 

48. 

82 

1. 

80 

3. 

55 

40 

77 

20 

50. 

52 

48. 

86 

1. 

66 

36 

20 

20.00 

18. 

88 

1. 

12 

5. 

60 

40 

78 

20 

20. 

00 

18. 

00 

1. 

00 

37 

20 

50.72 

49. 

10 

1. 

62 

3. 

19 

40 

79 

20 

50. 

86 

49. 

52 

1. 

34 

38 

20 

20.00 

19. 

00 

1. 

00 

5. 

00 

40 

80 

20 

20. 

00 

19. 

14 

0. 

86 

39 

20 

50.80 

49. 

56 

1 . 

24 

2. 

44 

40 

81 

20 

50. 

08 

00 

46 

1. 

62 

40 

20 

20.00 

19. 

00 

1. 

00 

5. 

00 

40 

82 

20 

20. 

00 

19. 

00 

1. 

00 

41 

20 

50.62 

49. 

26 

1. 

36 

2. 

00 

40 

83 

20 

50. 

70 

49. 

16 

1. 

54 

42 

20 

20.00 

18. 

64 

1. 

36 

6. 

80 

40 

84 

20 

20. 

00 

19. 

36 

0. 

64 

Av. 

20 

50.39 

48.1 

54 

1.' 

75 

3.- 

47 

40 

Av. 

20 

50.- 

14 

49.1 

09 

1.: 

35 

Av. 

20 

20.00 

00 

B2 

1.; 

18 

5.90 

40 

Av. 

20 

20.' 

00 

19. 

24 

0. 

76 


Per 

Cent 

Loss 


2.24 

2.80 

1.79 

1.98 

2.40 

2.10 

3.50 

2.55 

3.10 
2.47 

2.40 
2.44 

3.80 

2.70 
3.50 
3.07 

4.40 
2.86 

3.50 
2.87 
4.30 
2.37 
3.20 
2.61 

4.50 
3.23 

5.10 
3.04 

4.10 
2.68 

3.70 
3.18 

3.20 
3.28 
5.00 
2.63 

4.20 
3.23 
5.00 
3.04 

3.20 


2.68 


3.80 


Mesh 

On 


60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 

60 


60 


60 




















44 


MISSOURI SCHOOL OF MINES. 


TABLE No. 19 

LOSSES IN CUPELLATION 


Mesh Varying 


No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. 

Loss 

Per 

Cent 

Loss 

Mesh 

On 

No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. 

Loss 

Per 

Cent 

Loss 

Mesh 

On 

85 

20 

50.42 

49.30 

1.12 

2.22 

80 

127 

20 

50.16 

49.10 

1.06 

2.11 

100 

86 

20 

20.00 

19.36 

0.64 

3 .20 

80 

128 

20 

20.00 

19.56 

0.44 

2.20 

100 

87 

20 

50.46 

49.66 

0.80 

1.58 

80 

129 

20 

50.22 

49.28 

0.94 

1.87 

100 

88 

20 

20.00 

19.50 

0.50 

2.50 

80 

130 

20 

20.00 

19.52 

0.38 

1.90 

100 

89 

20 

50.54 

49.58 

0.95 

1.89 

80 

131 

20 

50.16 

49.24 

0.92 

1.83 

100 

90 

20 

20.00 

19.54 

0.46 

2.30 

80 

132 

20 

20.00 

19.36 

0.64 

3.20 

100 

91 

20 

50.60 

49.50 

1.10 

2.17 

80 

133 

20 

50.38 

49.38 

1.00 

1.98 

100 

92 

20 

20.00 

19.34 

0.66 

3.30 

80 

134 

20 

20.00 

19.22 

0.78 

3.90 

100 

93 

20 

50.02 

48.82 

1.20 

2.39 

80 

135 

20 

50.54 

49.40 

1.14 

2.25 

100 

94 

20 

20.00 

19.40 

0.60 

3.00 

80 

136 

20 

20.00 

19.28 

0.72 

3.60 

100 

95 

20 

50.54 

49.52 

1.02 

2.02 

80 

137 

20 

50.06 

48.88 

1.18 

2.35 

100 

96 

20 

20.00 

19.56 

0.44 

2.20 

80 

138 

20 

20.00 

19.30 

0.70 

3.50 

100 

97 

20 

50.16 

49.04 

1.12 

2.23 

80 

139 

20 

50.44 

49.36 

1.08 

2.14 

100 

98 

20 

20.00 

19.32 

0.68 

3.40 

80 

140 

20 

20.00 

19.40 

0.60 

3.00 

100 

99 

20 

50.48 

49.28 

1.20 

2.37 

80 

141 

20 

50.20 

49.14 

1.06 

2.11 

100 

100 

20 

20.00 

19.32 

0.68 

3.40 

80 

142 

20 

20.00 

19.36 

0.64 

3.20 

100 

101 

20 

50.40 

49.14 

1.26 

2.50 

80 

143 

20 

50.50 

49.22 

1.28 

2.53 

100 

102 

20 

20.00 

19.20 

0.80 

4.00 

80 

144 

20 

20.00 

19.40 

0.60 

3.00 

100 

103 

20 

50.58 

49.38 

1.20 

2.37 

80 

145 

20 

50.10 

49.00 

1.10 

2.19 

100 

104 

20 

20.00 

19.38 

0.62 

3.10 

80 

146 

20 

20.00 

19.34 

0.66 

3.30 

100 

105 

20 

50.68 

49.38 

1.30 

2.56 

80 

147 

20 

50.32 

49.00 

1.32 

2.62 

100 

106 

20 

20.00 

19.22 

0.78 

3.90 

80 

148 

20 

20.00 

19.10 

0.90 

4.50 

100 

107 

20 

50.58 

49.20 

1.38 

2.72 

80 

149 

20 

50.28 

48.82 

1.46 

2.90 

100 

108 

20 

20.00 

19.26 

0.74 

3.70 

80 

150 

20 

20.00 

19.22 

0.78 

3.90 

100 

109 

20 

50.66 

49.20 

1.46 

2.88 

80 

151 

20 

50.22 

48.76 

1.46 

2.90 

100 

110 

20 

20.00 

19.22 

0.78 

3.90 

80 

152 

20 

20.00 

19.42 

0.58 

2.90 

100 

111 

20 

50.40 

49.08 

1.32 

2.61 

80 

153 

20 

50.00 

48.52 

1.48 

2.96 

100 

112 

20 

20.00 

19.10 

0.90 

4.50 

80 

154 

20 

20.00 

19.24 

0.76 

3.80 

100 

113 

20 

50.28 

48.72 

1.56 

3.10 

80 

155 

20 

50.22 

48.70 

1.52 

3.02 

100 

114 

20 

20.00 

19.14 

0.86 

4.30 

80 

156 

20 

20.00 

19.24 

0.76 

3.80 

100 

115 

20 

50.72 

49.40 

1.32 

2.60 

80 

157 

20 

50.98 

49.66 

1.32 

2.58 

100 

116 

20 

20.00 

19.10 

0.90 

4.50 

80 

158 

20 

20.00 

19.12 

0.88 

4.40 

100 

117 

20 

50.46 

49.12 

1.34 

2.65 

80 

159 

20 

50.00 

48.50 

1.50 

3.00 

100 

118 

20 

20.00 

19.50 

0.50 

2.50 

80 

160 

20 

20.00 

19.34 

0.66 

3.30 

100 

119 

20 

50.34 

49.16 

1.18 

2.34 

80 

161 

20 

50.18 

48.80 

1.38 

2.75 

100 

120 

20 

20.00 




80 

162 

20 

20.00 

19.16 

0.84 

4.20 

100 

121 

20 

50.04 

49.02 

1.02 

2.04 

80 

163 

20 

50.46 

49.04 

1.42 

2.81 

100 

122 

20 

20.00 

19.20 

0.80 

4.00 

80 

164 

20 

20.00 

19.42 

0.58 

2.90 

100 

123 

20 

50.06 

48.74 

1.32 

2.63 

80 

165 

20 

50.62 

49.16 

1.46 

2.88 

100 

124 

20 

20.00 

19.30 

0.70 

3.50 

80 

166 

20 

20.00 

19.40 

0.60 

3.00 

100 

125 

20 

50.10 

49.14 

0.96 

1.91 

80 

167 

20 

50.60 

49.20 

1.40 

2.76 

100 

126 

20 

20.00 

19.16 

0.84 

4.20 

80 

168 

20 

20.00 

19.38 

0.62 

3.10 

100 

Av. 

20 

50.41 

49.21 

1.20 

2.38 

80 

Av. 

20 

50.31 

49.05 

1.26 

2.50 

100 

Av. 

20 

20.00 

19.31 

0.69 

3.45 

80 

Av. 

20 

20.00 

19.33 

0.67 

3.35 

100 















MISSOURI SCHOOL OF MINKS. 


45 


TABLE No. 19 

LOSSEvS IN CUPELLATION 
Mesh Varying 

Per Per 


No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 

No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 


Fb. 

Ag. 

Found 

Loss 

Loss 

On 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 

169 

20 

50.14 

49.04 

1.10 

2.19 

120 

211 

20 

50.62 

49.50 

1.12 

2.21 

150 

170 

. 20 

20.00 

19.38 

0.62 

3 .20 

120 

212 

20 

20.00 

19.52 

0.48 

2.40 

150 

171 

20 

50.30 

49.16 

1.14 

2.24 

120 

213 

20 

50.26 

49.12 

1.14 

2.27 

150 

172 

20 

20.00 

19.48 

0.52 

2.60 

120 

214 

20 

20.00 

19.38 

0.62 

3.10 

150 

173 

20 

50.42 

49.42 

1.00 

1.98 

120 

215 

20 

50.10 

49.06 

1.04 

2.07 

150 

174 

20 

20.00 

19.54 

0.46 

2.30 

120 

216 

20 

20.00 

19.46 

0.54 

2.10 

150 

175 

20 

50.14 

49.16 

0.98 

1.95 

120 

217 

20 

50.48 

49.46 

1.02 

2.02 

150 

176 

20 

20.00 

19.00 

1.00 

5.00 

120 

218 

20 

20.00 

19.40 

0.60 

3.00 

150 

177 

20 

50.00 

48.74 

1.26 

2.52 

120 

219 

20 

50.90 

49.62 

1.28 

2.51 

150 

178 

20 

20.00 

19.28 

0.72 

3.60 

120 

220 

20 

20.00 

19.44 

0.56 

2.80 

150 

179 

20 

50.62 

49.42 

1.20 

2.37 

120 

221 

20 

50.71 

49.50 

1.24 

2.44 

150 

180 

20 

20.00 

19.46 

0.54 

2.70 

120 

222 

20 

20.00 

19.38 

0.62 

3.10 

150 

181 

20 

50.52 

49.42 

1.10 

2.18 

120 

223 

20 

50.24 

49.04 

1.20 

2.39 

150 

182 

20 

20.00 

19.46 

0.54 

2.70 

120 

224 

20 

20.00 

19.56 

0.44 

2.20 

150 

183 

20 

50.30 

48.92 

1.38 

2.74 

120 

225 

20 

50.12 

48.76 

1.36 

2.71 

150 

184 

20 

20.00 

19.40 

0.60 

3.00 

120 

226 

20 

20.00 

19.54 

0.46 

2.30 

150 

185 

20 

50.80 

49.42 

1.38 

2.72 

120 

227 

20 

50.62 

49.32 

1.30 

2.56 

150 

186 

20 

20.00 

19.20 

0.80 

4.00 

120 

228 

20 

20.00 

19.40 

0.60 

3.00 

150 

187 

20 

50.50 

49.18 

1.32 

2.61 

120 

229 

20 

50.00 

48.76 

1.24 

2.48 

150 

188 

20 

20.00 

19.54 

0.46 

2.30 

120 

230 

20 

20.00 

19.46 

0.54 

2.70 

150 

189 

20 

50.18 

48.90 

1.28 

2.55 

120 

231 

20 

50.42 

49.28 

1.14 

2.26 

150 

190 

20 

20.00 

19.32 

0.68 

3.40 

120 

232 

20 

20.00 

19.32 

0.68 

3.40 

150 

191 

20 

50.52 

49.12 

1.40 

2.77 

120 

233 

20 

50.76 

49.44 

1.32 

2.60 

150 

192 

20 

20.00 

19.28 

0.72 

3.60 

120 

234 

20 

20.00 

19.16 

0.84 

4.20 

150 

193 

20 

50.12 

48.84 

1.28 

2.55 

120 

235 

20 

50.44 

49.04 

1.40 

2.77 

150 

194 

20 

20.00 

19.46 

0.54 

2.70 

120 

236 

20 

20.00 

19.04 

4.96 

4.80 

150 

195 

20 

50.64 

49.38 

1.26 

2.40 

120 

237 

20 

50.54 

49.24 

1.30 

2.57 

150 

196 

20 

20.00 

19.26 

0.74 

3.70 

120 

238 

20 

20.00 

19.32 

0.68 

3.40 

150 

197 

20 

50.40 

48.94 

1.46 

2.89 

120 

239 

20 

50.26 

48.86 

1.40 

2.78 

150 

198 

20 

20.00 

19.04 

0.96 

4.80 

120 

240 

20 

20.00 

19.08 

0.92 

4.60 

150 

199 

20 

50.30 

48.78 

1.52 

3.02 

120 

241 

20 

50.16 

48.74 

1.42 

2.83 

150 

200 

20 

20.00 

19.24 

0.76 

3.80 

120 

242 

20 

20.00 

19.18 

0.82 

4.20 

150 

201 

20 

50.28 

48.78 

1.50 

2.98 

120 

243 

20 

50.16 

48.90 

1.26 

2.51 

150 

202 

20 

20.00 

19.44 

0.56 

2.80 

120 

244 

20 

20.00 

19.12 

0.88 

4.40 

150 

203 

20 

50.14 

48.84 

1.30 

2.59 

120 

245 

20 

50.56 

49.20 

1.36 

2.69 

150 

204 

20 

20.00 

19.14 

0.86 

4.30 

120 

246 

20 

20.00 

19.26 

0.74 

3.70 

150 

205 

20 

50.28 

48.80 

1.48 

2.94 

120 

247 

20 

50.40 

49.00 

1 .40 

2.77 

150 

206 

20 

20.00 

19.20 

0.80 

4.00 

120 

248 

20 

20.00 

19.16 

0.84 

4.20 

150 

207 

20 

50.88 

49.28 

1.60 

3.14 

120 

249 

20 

50.24 

49.10 

1.14 

2.26 

150 

208 

20 

20.00 

19.36 

0.64 

3.20 

120 

250 

20 

20.00 

19.36 

0.64 

3.20 

150 

209 

20 

50.54 

49.16 

1.38 

2.72 

120 

251 

20 

50.46 

49.24 

1.22 

2.21 

150 

210 

20 

20.00 

19.22 

0.78 

3.90 

120 

252 

20 

20.00 

19.46 

0.54 

2.70 

150 

Av. 

20 

50.38 

49.08 

1.30 

2.52 

120 

Av. 

20 

50.40 

49.15 

1.25 

2.48 

150 

Av. 

20 

20.00 

19.32 

0.68 

3.40 

120 

Av. 

20 

20.00 

19.33 

0.67 

3.35 

150 




















46 


MISSOURI SCIIOOR OF MINES. 


TABLE No. 19 


LOSvSEvS IN CUPELLATION 

Mesh Varying 







Per 







Per 


No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 

No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 

253 

20 

50.52 

49.48 

1.04 

2.05 

200 

295 

20 

50.18 

49.04 

1.14 

2.27 

200 

254 

20 

20.00 

19.50 

0.50 

2.50 

200 

296 

20 

20.00 

19.42 

0.58 

2.90 

200 

255 

20 

50.40 

49.46 

1.04 

2.06 

200 

297 

20 

50.52 

49.58 

0.94 

1.86 

200 

256 

20 

20.00 

19.76 

0.24 

1.20 

200 

298 

20 

20.00 

19.54 

0.46 

2.30 

200 

257 

20 

50.46 

49.56 

0.90 

1.78 

200 

299 

20 

50.40 

44.50 

0.90 

1.78 

200 

258 

20 





200 

300 

20 

20.00 

19.46 

0.54 

2.70 

200 

259 

20 





200 

301 

20 

50.60 

49.56 

1.04 

2.05 

200 

260 

20 

20.00 

19.64 

0.36 

1.80 

200 

302 

20 

20.00 

19.20 

0.80 

4.00 

200 

261 

20 

50.46 

49.42 

1.04 

2.06 

200 

303 

20 

50.64 

49.40 

1.20 

2.37 

200 

262 

20 

20.00 

19.58 

0.42 

2.10 

200 

304 

20 

20.00 

28.74 

1.26 

6.30 

200 

263 

20 

50.16 

49.24 

0.92 

1.83 

200 

305 

20 

50.44 

49.16 

1.28 

2.53 

200 

264 

20 

20.00 

19.62 

0.38 

1.90 

200 

306 

20 

20.00 

29.38 

0.62 

3.10 

200 

265 

20 

50.14 

49.24 

0.90 

1.77 

200 

307 

20 

50.54 

49.30 

1.24 

2.45 

200 

266 

20 





200 

308 

20 

20.00 

19.42 

0.58 

2.90 

200 

267 

20 

50.10 

49.02 

1.08 

2.15 

200 

309 

20 

50.14 

48.76 

1.38 

2.75 

200 

268 

20 

20.00 

19.40 

0.60 

3.00 

200 

310 

20 

20.00 

19.16 

0.81 

4.20 

200 

269 

20 

50.34 

49.20 

1.14 

2.26 

200 

311 

20 

50.16 

48.84 

1.32 

2.63 

200 

270 

20 

20.00 

19.56 

0.46 

2.30 

200 

312 

20 

20.00 

19.26 

0.74 

3.70 

200 

271 

20 

50.34 

49.34 

1.00 

1.98 

200 

313 

20 

50.24 

49.04 

1.20 

2.39 

200 

272 

20 

20.00 

19.44 

0.56 

2.80 

200 

314 

20 

20.00 

19.12 

0.88 

4.40 

200 

273 

20 

50.14 

49.22 

0.92 

1.83 

200 

315 

20 

50.42 

49.22 

1.20 

2.38 

200 

274 

20 

20.00 

19.46 

0.54 

2.70 

200 

316 

20 

20.00 

19.34 

0.66 

3.30 

200 

275 

20 

50.04 

48.80 

1.24 

2.47 

200 

317 

20 

50.50 

49.08 

1.42 

2.81 

200 

276 

20 

20.00 

19.44 

0.56 

2.80 

200 

318 

20 

20.00 

19.38 

0.62 

3.10 

200 

277 

20 

50.26 

49.00 

1.26 

2.50 

200 

319 

20 

50.12 

48.72 

1.40 

2.79 

200 

278 

20 

20.00 

19.22 

0.78 

3.90 

200 

320 

20 

20.00 

19.28 

0.72 

3.60 

200 

279 

20 

50.68 

49.50 

1.18 

2.32 

200 

321 

20 

50.18 

48.78 

1.40 

2.79 

200 

280 

20 

20.00 

19.40 

0.60 

3.00 

200 

322 

20 

20.00 

19.38 

0.62 

3.10 

200 

281 

20 

50.56 

49.26 

1.30 

2.57 

200 

323 

20 

50.58 

49.10 

1.48 

2.92 

200 

282 

20 

20.00 

19.40 

0.60 

3.00 

200 

324 

20 

20.00 

19.38 

0.62 

3.10 

200 

283 

20 

50.12 

48.90 

1.22 

2.43 

200 

325 

20 

50.08 

48.54 

1.54 

3.07 

200 

284 

20 

20.00 

19.24 

0.76 

3.80 

200 

326 

20 

20.00 

19.20 

0.80 

4.00 

200 

285 

20 

50.64 

49.44 

1.20 

2.37 

200 

327 

20 

50.04 

48.54 

1.50 

2.99 

200 

286 

20 

20.00 

19.12 

0.88 

4.40 

200 

328 

20 

20.00 

19.24 

0.76 

3.80 

200 

287 

20 

50.42 

49.26 

1.16 

2.30 

200 

329 

20 

50.14 

48.66 

1.48 

2.95 

200 

288 

20 

20.00 

19.32 

0.68 

3.40 

200 

330 

20 

20.00 

19.34 

0.66 

3.30 

200 

289 

20 

50.38 

49.00 

1.38 

2.73 

200 

331 

20 

50.42 

48.92 

1.50 

2.97 

200 

290 

20 

20.00 

19.28 

0.72 

3.60 

200 

332 

20 

20.00 

19.34 

0.66 

3.30 

200 

291 

20 

50.36 

49.08 

1.28 

2.54 

200 

333 

20 

50.48 

49.04 

1.44 

2.85 

200 

292 

20 

20.00 

19.38 

0.62 

3.10 

200 

334 

20 

20.00 

19.30 

0.70 

3.50 

200 

293 

20 

50.15 

48.84 

1.30 

2.59 

200 

335 

20 

50.10 

48.68 

1.42 

2.83 

200 

294 

20 

20.00 

19.26 

0.74 

3.70 

200 

336 

20 

20.00 

19.30 

0.70 

3.50 

200 

Av. 

20 

50.33 

49.21 

1.12 

2.23 

200 

Av. 

20 

50.33 

49.02 

1.31 

2.60 

200 

Av. 

20 

20.00 

19.42 

0.58 

2.90 

200 

Av. 

20 

20.00 

19.24 

0.73 

3.53 

200 





















MISSOURI SCHOOL OF MINLS. 


47 


TABLE No. 20 
LOSvSES IN CUPELLATION 


Mesh Varying 







Per 







Per 


No. 

Gm. 

Mgg. 

Ag. 

Ag. 

Cent 

Mesh 

No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 

337 

20 

50.18 

48.34 

1.74 

3.46 

40 

357 

20 

50.44 

49.30 

1.14 

2.26 

60 

338 

20 

20.00 

18.52 

1.48 

7.40 

40 

358 

20 

20.00 

19.30 

0.70 

3.50 

60 

339 

20 

50.02 

47.90 

2.12 

4.24 

40 

359 

20 

50.20 

48.88 

1.32 

2.63 

60 

340 

20 

20.00 

18.92 

1.06 

5.30 

40 

360 

20 

20.00 

19.32 

0.68 

3.40 

60 

341 

20 

50.18 

47.78 

2.40 

4.78 

40 

361 

20 

50.26 

48.88 

1.38 

2.74 

60 

342 

20 

20.00 

18.90 

1.10 

5.50 

40 

362 

20 

20.00 

19.22 

0.78 

3.90 

60 

343 

20 

50.34 

48.22 

2.12 

4.22 

40 

363 

20 

50.00 

48.02 

1.98 

3.96 

60 

344 

20 

20.00 

18.12 

1.88 

9.40 

40 

364 

20 

20.00 

19.00 

1.00 

5.00 

60 

345 

20 

50.38 

46.52 

3.86 

7.70 

40 

365 

20 

50.46 

48.84 

1.62 

3.22 

60 

346 

20 

20.00 

18.76 

1.24 

6.20 

40 

366 

20 

20.00 

19.06 

0.94 

4.70 

60 

347 

20 

50.04 

47.40 

2.64 

5.28 

40 

367 

20 

50.46 

49.34 

1.12 

2.22 

60 

348 

20 

20.00 

18.34 

1.66 

8.30 

40 

368 

20 

20.00 

19.00 

1.00 

5.00 

60 

349 

20 

50.14 

45.22 

4.92 

9.82 

40 

369 

20 

50.14 

49.26 

0.88 

1.75 

60 

350 

20 

20.00 

18.68 

1.32 

6.60 

40 

370 

20 

20.00 

19.12 

0.88 

4.40 

60 

351 

20 

50.28 

48.90 

1.38 

2.74 

40 

371 

20 

50.16 

48.62 

1.54 

3.06 

60 

352 

20 

20.00 

18.10 

1.90 

9.50 

40 

372 

20 

20.00 

18.86 

1.14 

5.70 

60 

353 

20 

50.34 

47.04 

3.30 

6.58 

40 

373 

20 

50.06 

48.42 

1.64 

3.27 

60 

354 

20 

20.00 

18.24 

1.76 

8.80 

40 

374 

20 

20.00 

19.18 

0.82 

4.10 

60 

355 

20 

50.56 

46.16 

4.50 

8.97 

40 

375 

20 

50.26 

48.90 

1.36 

2.70 

60 

356 

20 

20.00 

18.14 

1.86 

9.30 

40 

376 

20 

20.00 

19.00 

1.00 

5.00 

60 








377 

20 

50.60 

49.00 

1.60 

3.18 

60 








378 

20 

20.00 

19.08 

0.92 

4.60 

60 








379 

20 

50.14 

48.40 

1.74 

3.46 

60 . 








380 

20 

20.00 

19.40 

0.60 

3.00 

60 








381 

20 

50.38 

48.60 

1.78 

3.54 

60 








382 

20 

20.00 

18.92 

1.08 

5.40 

60 




, 




383 

20 

50.62 

48.86 

1.76 

3.50 

60 





% 



384 

20 

20.00 

18.84 

1.16 

5.80 

60 








385 

20 

50.38 

48.92 

1.46 

2.90 

60 








386 

20 

20.00 

19.12 

0.88 

4.40 

60 








387 

20 

50.28 

48.80 

1.48 

2.94 

60 








388 

20 

20.00 

19.04 

0.96 

4.80 

60 

Av. 

20 

50.24 

47.35 

2.89 

5.76 

40 

Av. 

20 

50.30 

48.81 

1.49 

2.96 

60 


Av. 20 20.00 18.47 1.53 7.63 40 Av. 20 20.00 19.09 0.91 4.54 60 

























48 


MISSOURI SCHOOL OF MINLS. 


TABLE No. 20 

LOSSES IN CUPELLATION 
Mesh Varying 


Per Per 


No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 

No. 

Gm. 

Mgs. 

Ag. 

Ag. 

Cent 

Mesh 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 


Pb. 

Ag. 

Found 

Loss 

Loss 

On 

389 

20 

50.14 

48.92 

1.22 

2.42 

80 

431 

20 

50.12 

49.18 

0.94 

1.86 

100 

390 

20 

20.00 

19.10 

0.90 

4.50 

80 

432 

20 

20 00 

19.48 

0.52 

2.60 

100 

391 

20 

50.10 

49.22 

0.88 

1.74 

80 

433 

20 

50.20 

49.22 

0.98 

1.94 

100 

392 

20 

20.00 

19.14 

0.86 

4.30 

80 

434 

20 

20.00 

19.50 

0.50 

2.50 

100 

393 

20 

50.68 

49.60 

1.08 

2.14 

80 

435 

20 

50.72 

49.88 

0.84 

1.65 

100 

394 

20 

20.00 

19.36 

0.64 

3.20 

80 

436 

20 

20.00 

19.62 

0.38 

1.90 

100 

395 

20 

50.06 

48.86 

1.36 

2.50 

80 

437 

20 

50.38 

49.46 

0.92 

1.82 

100 

396 

20 

20.00 

19.46 

0.54 

2.70 

80 

438 

20 

20.00 

19.36 

0.64 

3.20 

100 

397 

20 

50.40 

49.24 

1.16 

2.30 

80 

439 

20 

50.70 

49.80 

0.90 

1.77 

100 

398 

20 

20.00 

19.40 

0.60 

3.00 

80 

440 

20 

20.00 

19.52 

0.48 

2.40 

100 

399 

20 

50.22 

49.00 

1.22 

2.42 

80 

441 

20 

50.78 

49.86 

0.92 

1.81 

100 

400 

20 

20.00 

19.14 

0.86 

4.30 

80 

442 

20 

20.00 

19.52 

0.48 

2.40 

100 

401 

20 

50.04 

48.78 

1.26 

2.52 

80 

443 

20 

50.50 

49.56 

0.94 

1.86 

100 

402 

20 

20.00 

19.52 

0.48 

2.40 

80 

444 

20 

20.00 

19.42 

0.58 

2.90 

100 

403 

20 

50.66 

49.32 

1.34 

2.66 

80 

445 

20 

50.20 

49.18 

1.02 

2.02 

100 

404 

20 

20.00 

19.28 

0.72 

3.60 

80 

446 

20 

20.00 

19.28 

0.72 

3.60 

100 

405 

20 

50.40 

49.62 

0.78 

1.54 

80 

447 

20 

50.46 

49.22 

1.24 

2.46 

100 

406 

20 

20.00 

19.20 

0.80 

4.00 

80 

448 

20 

20.00 

19.32 

0.68 

3.40 

100 

407 

20 

50.30 

49.08 

1.22 

2.42 

80 

449 

20 

50.22 

49.30 

1.82 

1.82 

100 

408 

20 

20.00 

19.32 

0.68 

3.40 

80 

450 

20 

20.00 

19.48 

0.52 

2.60 

100 

409 

20 

50.40 

49.06 

1.34 

2.66 

80 

451 

20 

50.54 

49.68 

0.86 

1.70 

100 

410 

20 

20.00 

19.10 

0.90 

4.50 

80 

452 

20 

20.00 

19.26 

0.74 

3.70 

100 

411 

20 

50.38 

48.80 

1.58 

3.14 

80 

453 

20 

50.40 

49.36 

1.04 

2.06 

100 

412 

20 

20.00 

19.30 

0.70 

3.50 

80 

454 

20 

20.00 

19.18 

0.82 

4.10 

100 

413 

20 

50.08 

48.66 

1.42 

2.82 

80 

455 

20 

50.14 

49.00 

1.14 

2.26 

100 

414 

20 

20.00 

19.44 

0.56 

2.80 

80 

456 

20 

20.00 

19.40 

0.60 

3.00 

100 

415 

20 

50.14 

48.78 

1.36 

2.70 

80 

457 

20 

50.76 

49.90 

0.86 

1.70 

100 

416 

20 

20.00 

19.26 

0.74 

3.70 

80 

458 

20 

20.00 

19.52 

0.48 

2.40 

100 

417 

20 

50.26 

48.76 

1.48 

2.94 

80 








418 

20 

20.00 

19.20 

0.80 

4.00 

80 








419 

20 

50.18 

48.58 

1.60 

3.18 

80 








420 

20 

20.00 

19.06 

0.94 

4.70 

80 








421 

20 

50.24 

48.82 

1.42 

2.82 

80 








422 

20 

20.00 

19.10 

0.90 

4.50 

80 








423 

20 

50.30 

48.86 

1.44 

2.86 

80 








424 

20 

20.00 

19.20 

0.80 

4.00 

80 








425 

20 

50.10 

48.78 

1.32 

2.62 

80 








426 

20 

20.00 

19.44 

0.56 

2.80 

80 








427 

20 

50.38 

50.14 

0.24 

0.48 

80 








428 

20 

20.00 

19.46 

0.54 

2.70 

80 








429 

20 

50.60 

49.00 

1.60 

3.18 

80 








430 

20 

20.00 

19.16 

0.84 

4.20 

80 








Av. 

20 

50.29 

49.04 

1.25 

2.49 

80 

Av. 

20 

50.43 

49.46 

0.97 

1.91 

100 

Av. 

20 

20.00 

19.27 

0.73 

3 65 

80 

Av. 

20 

20.00 

19.42 

0.58 

2.90 

100 


























MISSOURI SCHOOL OF MINES. 


49 


TABLE No. 20 


LOSSES IN CUPELLATION 
Mesh Varying 


No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. 

Loss 

Per 

Cent 

Loss 

Mesh 

On 

No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. 

Loss 

Per 

Cent 

Loss 

Mesh 

On 

459 

20 

50.34 

49.30 

1.04 

2.06 

120 

493 

20 

50.56 

49.46 

0.90 

1.78 

150 

460 

20 

20.00 

19.62 

0.38 

1.90 

120 

494 

20 

50.20 

49.26 

0.94 

1.86 

150 

461 

20 

50.20 

49.16 

1.04 

2.06 

120 

495 

20 

50.28 

49.40 

0.88 

1.74 

150 

462 

20 

20.00 

19.48 

0.52 

2.60 

120 

496 

20 

50.48 

49.36 

1.12 

2.22 

150 

463 

20 

50.42 

49.24 

1.18 

2.34 

120 

497 

20 

50.44 

49.40 

1.04 

2.06 

150 

464 

20 

20.00 

19.66 

0.34 

1.70 

120 

498 

20 

50.50 

49.46 

1.04 

2.06 

150 

465 

20 

50.44 

49.44 

1.00 

1.98 

120 

499 

20 

50.66 

49.66 

1.00 

1.98 

150 

466 

20 

20.00 

19.26 

0.74 

3.70 

120 

500 

20 

50.08 

49.12 

0.96 

1.90 

150 

467 

20 

50.32 

49.14 

1.18 

2.34 

120 

501 

20 

50.70 

49.72 

0.98 

1.94 

150 

468 

20 

20.00 

19.44 

0.56 

2.80 

120 

502 

20 

50.80 

49.68 

1.12 

2.22 

150 

469 

20 

50.60 

49.50 

1.10 

2.18 

120 

503 

20 

50.14 

49.04 

1.10 

2.18 

150 

470 

20 

50.34 

49.28 

1.06 

2.10 

120 

504 

20 

50.48 

49.42 

1.06 

2.10 

150 

471 

20 

50.36 

49.28 

1.08 

2.14 

120 

505 

20 

50.22 

49.20 

1.02 

2.02 

150 

472 

20 

50.34 

49.10 

1.24 

2.46 

120 

506 

20 

50.14 

49.14 

1.00 

1.98 

150 

473 

20 

50.44 

49.04 

1.40 

2.78 

120 

507 

20 

50.22 

49.20 

1.02 

2.02 

150 

474 

20 

50.58 

49.40 

1.18 

2.34 

120 

508 

20 

50.24 

49.28 

0.96 

1.90 

150 

475 

20 

50.22 

48.86 

1.36 

2.70 

120 

509 

20 

50.36 

49.40 

0.96 

1.90 

150 

476 

20 

50.72 

49.44 

1.28 

2.50 

120 

510 

20 

50.52 

49.40 

1.12 

2.22 

150 

477 

20 

50.48 

49.30 

1.18 

2.34 

120 

511 

20 

50.30 

49.18 

1.12 

2,22 

150 

478 

20 

50.20 

49.10 

1.10 

2.18 

120 

512 

20 

50.36 

49.14 

1.18 

2.34 

150 

479 

20 

50.12 

48.72 

1.40 

2.78 

120 

513 

20 

50.18 

49.00 

1.18 

2.34 

150 

480 

20 

50.30 

48.88 

1.42 

2.82 

120 

514 

20 

50.24 

49.08 

1.16 

2.30 

150 

481 

20 

50.52 

49.10 

1.42 

2.82 

120 

515 

20 

50.32 

49.20 

1.12 

2.22 

150 

482 

20 

50.80 

49.36 

1.44 

2.86 

120 

516 

20 

50.40 

49.28 

1.12 

2.22 

150 

483 

20 

50.72 

49.42 

1.30 

2.58 

120 

517 

20 

50.14 

48.88 

1.26 

2.50 

150 

484 

20 

50.32 

48.96 

1.36 

2.70 

120 

518 

20 

50.04 

48.80 

1.24 

2.46 

150 

485 

20 

50.40 

49.62 

1.28 

2.52 

120 

519 

20 

50.48 

49.22 

1.26 

2.50 

150 

486 

20 

50.72 

49.40 

1,32 

2,60 

120 

520 

20 

50.08 

48.88 

1.20 

2.38 

150 

487 

20 

50.46 

49.04 

1.42 

2.82 

120 

521 

20 

50.44 

49.18 

1.26 

2.50 

150 

488 

20 

50.46 

49.20 

1.26 

2.54 

120 

522 

20 

50.10 

48.78 

1.32 

2.62 

150 

489 

20 

50.42 

49.00 

1.42 

2.82 

120 

523 

20 

50.00 

48.82 

1.18 

2.34 

150 

490 

20 

50.34 

48.90 

1.44 

2.86 

120 

524 

20 

50.76 

49.60 

1.16 

2.30 

150 

491 

20 

50.16 

48.82 

1.34 

2.66 

120 

525 

20 

50.44 

49.30 

1.14 

2.26 

150 

492 

20 

50.74 

49.50 

1.24 

2.46 

120 

526 

20 

50 .*38 

49.12 

1.26 

2.50 

150 








527 

20 

50.48 

49.36 

1.12 

2.22 

150 








528 

20 

50.54 

49.38 

1.16 

2.30 

150 








529 

20 

50.76 

49.40 

1.36 

2.70 

150 








530 

20 

50.50 

49.58 

0.92 

1.82 

150 

Av. 

20 

50.42 

49.16 

1.26 

2.50 

120 

Av. 

20 

50.37 

49.26 

1.11 

2.20 

150 


Av. 20 20.00 49.49 0.51 2.54 120 






















50 


MISSOURI SCHOOL OF MINES. 


TABLE No. 20 


LOSSES IN CUPELLATION 
Mesh Varying 


No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. 

Loss 

Per 

Cent 

Loss 

Mesh 

On 

No. 

Gm. 

Pb. 

Mgs. 

Ag. 

Ag. 

Found 

Ag. < 
Loss 

Per 

Cent Mesh 
Loss On 

531 

20 

50.14 

49.20 

0.94 

1.86 

200 

572 

20 

50.22 

49.16 

1.06 

2.10 

200 

632 

20 

50.30 

49.26 

1.04 

2.06 

200 

573 

20 

50.70 

49.82 

0.88 

1.74 

200 

533 

20 

50.50 

49.64 

0.86 

1.70 

200 

574 

20 

50.00 

48.94 

1.06 

2.12 

200 

534 

20 

50.78 

49.92 

0.86 

1.70 

200 

575 

20 

50.28 

49.20 

1.08 

2.14 

200 

535 

20 

50.50 

49.64 

0.86 

1.70 

200 

576 

20 

50.78 

49.94 

0.84 

1.66 

200 

536 

20 

50.42 

49.42 

1.00 

1.98 

200 

577 

20 

50.28 

49.34 

0.94 

1.86 

200 

537 

20 

50.00 

48.96 

1.04 

2.08 

200 

578 

20 





200 

538 

20 

50.66 

49.62 

1.09 

2.06 

200 

579 

20 

50.18 

49.10 

1.08 

2.14 

200 

539 

20 

50.00 

49.02 

0.98 

1.94 

200 

580 

20 

50.26 

49.14 

1.12 

2.22 

200 

540 

20 

50.56 

49.56 

1.00 

1.98 

200 

581 

20 

50.04 

48.92 

1.12 

2.22 

200 

541 

20 

50.24 

49.18 

1.06 

2.10 

200 

582 

20 

50.28 

49.18 

1.10 

2.18 

200 

542 

20 

50.48 

49.50 

0.98 

1.94 

200 

583 

20 

50.18 

49.12 

1.06 

2.10 

200 

543 

20 

50.22 

49.32 

0.90 

1.78 

200 

584 

20 

50.64 

49.56 

1.08 

2.16 

200 

544 

20 

50.14 

49.06 

1.08 

2.14 

200 

585 

20 

50.56 

49.52 

1.04 

2.06 

200 

545 

20 

50.06 

49.00 

1.06 

2.10 

200 

586 

20 

50.48 

49.30 

1.18 

2.34 

200 

546 

20 

50.24 

49.20 

1.04 

2.06 

200 

587 

20 

50.56 

49.40 

1.16 

2.30 

200 

547 

20 

50.14 

49.04 

1.10 

2.18 

200 

588 

20 

50.00 

48.78 

1 .22 

2.44 

200 

548 

20 

50.12 

49.06 

1.06 

2.10 

200 

589 

20 

50.18 

49.00 

1.18 

2.34 

200 

549 

20 

50.66 

49.62 

1.04 

2.06 

200 

590 

20 

50.22 

49.06 

1.16 

2.30 

200 

550 

20 

50.74 

49,68 

1.06 

2.10 

200 

591 

20 

50.38 

49.28 

1.10 

2.18 

200 

551 

20 

50.30 

49.24 

1.06 

2.10 

200 

,592 

20 

50.74 

49.64 

1.10 

2.18 

200 

552 

20 

50.14 

48.94 

1.20 

2.38 

200 

593 

20 

50.42 

49.16 

1.26 

2.50 

200 

553 

20 

50.60 

49.38 

1.22 

2.42 

200 

594 

20 

50.30 

48.94 

1.36 

2.70 

200 

554 

20 

50.64 

49.48 

1.16 

2.30 

200 

595 

20 

50.16 

48.88 

1.28 

2.54 

200 

555 

20 

50.02 

49.46 

1.16 

2.30 

200 

596 

20 

50.62 

49.38 

1.24 

2.46 

200 

556 

20 

50.12 

48.92 

1.20 

2.38 

200 

597 

20 

50.32 

49.00 

1.32 

2.62 

200 

557 

20 

50.24 

49.12 

1.12 

2.22 

200 

598 

20 

50.68 

49.38 

1.30 

2,58 

200 

558 

20 

50.44 

49.14 

1.30 

2.58 

200 

599 

20 

50.60 

49.42 

1.18 

2.34 

200 

559 

20 

50.28 

49.02 

1.26 

2.50 

200 

600 

20 

50.40 

49,08 

1.32 

2.62 

200 

560 

20 

50.20 

48.90 

1.30 

2.58 

200 

601 

20 

50.46 

49.06 

1.40 

2.78 

200 

561 

20 

50.50 

49.24 

1.26 

2.50 

200 

602 

20 

50.16 

48.80 

1.36 

2.70 

200 

562 

20 

50.06 

48.80 

1.26 

2.50 

200 

603 

20 

50.60 

49.34 

1.26 

2.50 

200 

563 

20 

50.14 

49.00 

1.14 

2.26 

200 

604 

20 

50.04 

48.72 

1.32 

2.62 

200 

564 

20 

50.30 

49.20 

1.10 

2.18 

200 

605 

20 

50.44 

49.12 

1.22 

2.42 

200 

565 

20 

50.04 

48.96 

1.08 

2.14 

200 

606 

20 

50.12 

48.84 

1.28 

2.54 

200 

566 

20 

50.40 

49.22 

1.18 

2.34 

200 

607 

20 





200 

567 

20 

50.34 

49.08 

1.26 

2.50 

200 

608 

20 

50.08 

48.82 

1.26 

2.50 

200 

568 

20 

50.32 

49.14 

1.16 

2.30 

200 

609 

20 

50.34 

48.92 

1.42 

2.80 

200 

569 

20 

50.32 

49.24 

1.08 

2.14 

200 

610 

20 

50.20 

48.92 

1.28 

2.54 

200 

570 

20 

50.10 

48.84 

1.26 

2.50 

200 

611 

20 

50.22 

48.96 

1.26 

2.50 

200 

571 

20 

50.20 

49.12 

1.08 

2.14 

200 

612 

20 

50.70 

49.46 

1.26 

2.50 

200 








613 20 

50.16 

i 48.96 

1.20 

2.38 

200 

Av. 

20 

50.32 

49.23 

1.09 

2.16 

200 

Av. 

20 

50.34 

49.17 

1.17 

2.33 

200 







MISSOURI SCHOOL OF MINES. 


51 


Table No. 21 

LOSSES IN CUPELLATION 
Mesh Varying 


Mesh 

No. of 

Cupellations 

Mgs. 

Silver 

Mgs. Ag. 
Found 

Mgs. Ag. 
Loss 

% Ag. 
Loss 

On 

40 

30 

20 

18.70 

1.30 

6.50% 

On 

60 

37 

20 

19.17 

0.83 

4.15% 

On 

80 

41 

20 

19.29 

0.71 

3.55% 

On 

100 

35 

20 

19.36 

0.64 

3.20% 

On 

120 

26 

20 

19.36 

0.64 

3.20% 

On 

150 

21 

20 

19.33 

0.67 

3.35% 

On 

200 

19 

20 

19.42 

0.58 

2.90% 

Thru 200 

21 

20 

19.24 

0.73 

3.53% 

On 

40 

31 

50.34 

48.22 

2.12 

4.21% 

On 

60 

37 

50.38 

48.97 

1.41 

2.79% 

On 

80 

42 

50.35 

49.12 

1.23 

2.44% 

On 

100 

35 

50.36 

49.23 

1.13 

2.24% 

On 

120 

50 

50.41 

49.13 

1.28 

2.54% 

On 

150 

59 

50.38 

49.22 

1.16 

2.30% 

Oil 

200 

61 

50.32 

49.22 

1.10 

2.18% 

Thru 

[ 200 

61 

50.34 

49.12 

1.22 

2.42% 


From the results obtained it is evident that providing the 
boneash is through 60 mesh the size of the particles makes prac- 
ticallv no difference in the losses. 

No trouble was experienced with any of the cupels and the 
time of cupellation was practically the same in all cases, there being 
only about two minutes difference in the time required for the “on 
80” mesh and “thru 200” mesh. 








52 


MISSOURI SCHOOL OF MINES. 


Assay Slags and Their Relation to Silver Losses in the Fire Assay. 

The losses occurring in the crucible during the fire assay may 
be classified as follows : 

(1) Those of a physical nature: 

(a) Imperfect decomposition. 

(b) Dusting, spitting, etc. 

(c) Suspension of lead particles in the slag. 

(d) Volatilization. 

(2) Those of a chemical nature: 

(a) Due to the solvent action of the slag on silver. 

Authorities on Fire Assaying give little space to the efiect of 
the chemical composition of the slag on losses except that litharge 
will dissolve silver. 

Fulton in his Manual on Assaying says: “The most desirable 
constitution for any assay slag, is that of a monosilicate or a sesqui- 
silicate, sometimes, but more rarely a bisilicate. If the ore is basic 
a bisilicate may be approached, if acid a monosilicate, or even a sub¬ 
silicate, in order to insure complete decomposition of the ore.” 

Believing that the losses affected by the physical conditions of 
a slag are the most common, and that those due to a change in the 
chemical composition of a slag are negligible in most assay work, 
the Missouri School of Mines Assay Laboratory advocates propor¬ 
tioning the charge for a fire assay so as to fulfill the following font 
requirements: 

(1) Complete decomposition of the ore. 

(2) Formation of a fluid slag. 

(3) Furnishing of the proper amount of collector at the proper 

time. 

(4) Keeping out of the lead button any impurities that might 

cause a loss in subsequent operations. 

In attempting to determine whether or not any losses affected 
by the chemical composition of a slag are negligible, a number oi 
experiments were made with a series of fusions so calculated as to 
give 50 grams of slag and of a certain definite silicate degree. The 
conditions of cupellation were kept as constant as possible, as were 
all other conditions that might affect the results. Standard rea¬ 
gents were used on the same amount of silver, as a silver salt added 
to each fusion. The data obtained is arranged in Tables I, II, HI. 
The second set of experiments, with conditions the same as above 
except that the amount of slag formed was not constant, were per¬ 
formed on a certain silver ore. The data is arranged in Tables IV- 
XI, inclusive. 


MISSOURI SCHOOL OF MINES. 


53 


Table I 

THE LEAD SILICATES 

Charge: 

50 grams slag formers, 
litharge, argol, and cover, 
silver salt. 


No. 

Degree 

Silver 

Recovered 

Average 

1 


17.95 


2 

PbO 

17.90 


O 

O 


17.93 

17.92 

4 


18.00 


5 

wSub 

18.05 


6 


18.02 

18.02 

7 


18.38 


8 

Alono 

18.42 


9 


18.44 

18.41 

10 


18.61 


11 

Sesqui 

18.54 

18.53 

12 

18.46 

13 


18.26 


14 

Bi 

18.32 


15 


18.23 

18.27 

16 


17.98 


17 

Tri 

18.00 


18 


18.12 

18.03 


Average 18.196 









54 


MISSOURI SCHOOL OF MINFS. 


The Effect of Acidity of Slags on Silver Recovery. 


Table II 


THE SODA BORATES 


Charge; 

50 grams slag formers, 
litharge, argol, and cover, 
silver salt. 




No. 

Degree 

Silver 

Recovered 

Average 

19 


18.68 


20 

Sub 

18.48 


21 


18.50 

18.54 

22 


18.34 froze 


23 

vSub 

18.70 


24 


18.72 

18.71 

25 


18.24 


26 

Mono 

18.58 


27 


18.68 

18.63 

28 


18.22 


29 

Sesqui 

18.00 


30 


18.12 

18.11 

31 


18.16 


32 

Bi 

18.26 


33 


18.16 

18.20 

34 


18.32 


35 

Tri 

18.30 


36 


18.26 

18.29 


Average 18.430 





MISSOURI SCHOOL OF MINES. 


55 


The Effect of Acidity of Slags on Silver Recovery. 

Table III 

THE SODA SILICATES 

Charge: 

50 grams slag formers, 
litharge, argol, and cover, •, 
silver salt. 


No. 

Degree 

Silver 

Recovered 

Average 


37 


18.22 



38 

Pure Soda 

18.30 



39 


18.26 

18.26 


40 


18.52 



41 

90% NaiO 

18.40 



42 


18.28 

18.40 


43 


18.30 



44 

Sub 

18.24 



45 


18.18 

18.24 


46 


18.24 



47 

Mono 

18.30 



48 


18.34 

18.29 


' 49 


18.40 



50 

Sesqui 

18.50 



51 

18.45 

18.45 


52 


18.18 



53 

Bi 

18.18 



54 


18.20 

18.19 


55 


18.31 



56 

Tri 

18.28 



57 


18.27 

18.29 


58 


18.08 



59 


18.12 



60 


18.00 

• 18.06 



Average 18.273 









56 


MISSOURI SCHOOL OF MINKS. 


Assay of a certain Silver Ore. 

Table IV 

Proximate analysis: 

Si02 67% 

AI 3 O 2 12% 

CaO 5% 

Pyrite, galena, sphalerite, chalcopyrite. 

Reducing power 1 gram. 

Charge constant: 

Yi A. T. Ore, 

Salt cover, 

23 grams PbO for Collector, 

Argol, 

Lead varying above 23 grams. 


No. 

PbO 

grams 

Approx. 

Degree 

O 2 . in Acids 
O 2 . in Bases 

Silver 

mgms. 

Average 

Remarks 

8 

30 

6.5:1.5 

24.76 


Lead parti- 

8b 



26.82 


cles thruout 

8b 



27.76 

26.45 

slag. 

9 

40 

6.5:2.2 

25.90 


Fusion 

9b 



27.20 


poor. 

9b 



27.54 



31 



No 


Rejected. 

32 



No 


Lead in 

33 



No 

26.88 

suspension. 

10 

50 

6.5:2.9 

27.66 


Rejected 

10b 



27.60 


as 

10b 



No 


above. 

34 



No 



35 



No 



36 



No 

27.63 


11 

60 

6.5:3.6 

27.94 



11b 



27.74 



11b 



27.96 



37 



28.02 



38 



27.88 



39 



No 

27.91 


12 

70 

6.5:4.3 

28.92 



12b 



27.90 



12b 



27.86 



40 



28.18 



41 



28.26 



42 



28.16 

28.21 


13 

■ 80 

6.5:5.0 

27.96 



13b 



27.84 



13b 



27.72 



43 

> 


28.34 



44 



28.10 



45 



28.28 

28.04 


14 

90 

6.5:5.7 

27.40 



14b 



27.52 



14b 



27.51 • 

27.48 



Average 27.91 






MISSOURI SCHOOL OF MINLS. 


57 


Assay of a certain Silver Ore. 

Table V 

Charge constant: 

K A. T. Ore, 

Salt cover, 

23 grams PbO for collector, 
Argol, 

Soda varying. 


No. 

Soda 

grams 

Approx. 

Degree 

Oi. in Acid 
Oi. in Bases 

Silver 

mgms. 

Average 

Remarks 

1 

30 

6.5:5.5 

27.40 



la 



28.06 



lb 



28.04 



Ic 



28.00 



2c 



28.04 



3c 



28.12 

27.94 


2 

40 

6.5:7.0 

27.96 



2b 



27.86 



2b 



27.86 



2c 



27.74 



2c 



27.85 



2c 



27.90 

27.86 



50 

6.5:8.5 

28.00 






27.82 






27.82 



■ 



27.88 






27.94 

27.89 


• 

60 

6.5:10.0 

27.92 






27.72 






28.04 






27.90 






27.86 

27.89 



70 

6.5:11.5 

27.84 






27.90 






.27.96 


- ...... .-4 




28.00 

27.92 



80 

6.5:13.0 

27.94 






27.68 

27.81 



90 

6.5:14.5 

27.26 






27.42 






27.68 

27.45 



Average 27.82 










58 


MISSOURI SCHOOL OF MINES. 


Assay of a certain Silver Ore. 

Table VI 

Charge: 

Y 2 A. T. Ore, 

23 grams PbO for collector, 
Argol, 

Salt cover. 

Borax varying. 


No. 

Borax 

grams 

Approx, 

Degree 

O 2 . in Acid 
0^. in Bases 

Silver 

mgms. 

Average 

Remarks 

1 

30 

13.2:3.37 

27.66 



2 



27.70 



3 



27.68 

27.68 


4 

40 

15.7:4.16 

27.98 



5 



27.58 



6 



27.70 

27.75 


7 

50 

18.0:4.95 

27.70 



8 



27.58 



9 



27.68 

27.65 


10 

60 

20.4:5.74 

27.72 



11 



27.64 



12 



27.84 

27.73 

• 

13 

70 

22.8:6.63 

27.54 



14 



27.86 



15 



27.84 

27.75 


16 



Lost 



17 



27.64 



18 



Lost 

27.64 



Average 27.70 





MISSOURI SCHOOIv OF MINKS. 


59 ' 


Assay of a certain Silver Ore. 


Table VII 


Charge: 

}/2 A, T. Ore, 

20 grams Soda, 

23 grams PbO for collector, 
20 grams PbO excess, 
wSalt cover. 


No. 

Approx. 

Degree 

Oi. in Acids 
Oi. in Bases 

Silver 

mgms. 

Average 

Remarks 

1 

9 

3 

6.2:5.4 

28.20 

28.20 

28.20 

28.20 


Assay of a certain Silver 

Ore. 



Table VIII 

Charge: 

34 A. T. Ore, 

20 grams Soda, 

23 grams PbO for collector, 

20 grams PbO excess, 

20 grams Borax, 

Salt cover. 



No. 

Approx. 

Degree 

Silver 

mgms. 

Average 

Remarks 

1 

2 

3 

10.9:7.0 

28.10 

28.16 

28.00 

28.09 


Assay of a certain Silver Ore. 



Charge: 

34 A.T. Ore, 

15 grams Soda, 

15 grams PbO, 

30 grams Borax, 
Salt cover. 

Table IX 



No. 

Approx. 

Degree 

Silver 

mgms. 

Average 

Remarks 

1 

2 

3 

11.3:9.9 

28.42 

28.74 

28.44 

28.53 

Lots of 
feathers. 





















60 


MISSOURI SCHOOU OF MINES. 


Assay of a certain Silver Ore. 


Charge: 

A. T, Ore, 

10 grams Soda, 
10 grams PbO, 
30 grams Borax, 
Salt cover. 


Table X 


No. 

Approx. 

Degree 

Silver 

mgms. 

Average 

Remarks 

28 

13.3:5.6 

28.14 



29 


27.90 



30a 


28.02 

28.02 



Assay of a certain Silver Ore. 

Table XI 

Charge: 

H A. T. Ore, 

23 grams PbO, 

60 grams Borax, 

Salt cover. 


No. 

Approx. 

Degree 

Oi. in Acids 

0-2. in Base 

Silver 

mgms. 

Average 

Remarks 

1 

20.4:6.7 

28.22 



2 


28.27 



3 


Lost 

28.24 



Conclusions. Under ordinary working conditions of assaying 
the chemical composition of the resulting slag has very little effect 
upon the silver recovery so long as the four requirements of a good 
fusion are fulfilled. 








MISSOURI SCHOOL OF MINES 
BULLETINS 


Technical Series. 

Vol. 1, No. 1. November, 1911. Friction in air pipes. E. G. 
Harris. (Continuation of General Series, Vol. 2, No. 4.) 

•Vol. 1, No. 2. February, 1912. Metallurgical and ore dressing 
laboratories of the Missouri School of Mines and Metallurg}'. D. Cope¬ 
land, H. T. Mann, H. A. Roesler (Out of print). 

Vol. 1, No. 3. May, 1912. Some apparatus and methods for dem¬ 
onstrating rock drilling and the loading of drill holes in tunneling. 
D. E. Young. 

Vol. 1, No. 4. August, 1912. Friction in air pipes. E. G. Harris. 
(Continuation of Vol. 1, No. 1, November, 1911.) 

Vol. 2, No. 1. August, 1915. Comparative Tests of Piston-Drill 
Pits. C. R. Forbes and L. M. Cummings. 

Vol. 2, No. 2. November, 1915. Orifice measurements of air in 
large quantities. Elmo G. Harris. 

Vol. 2, No. 3. February, 1916. Cupellation I.osses in Assaying. 
PI. T. Mann and C. Y. Clayton. 

General Series. 

Vol. 7, No. 4. September, 1915. Register of Graduates. 

Vol. 8, No. 1. January, 1916. Bibliography on concentrating ores 
by flotation. Jesse Cunningham. 

Vol. 8, No. 2. March, 1916. Annual catalogues 1915-16. 

































